1. A sEH inhibitor or a pharmaceutically acceptable composition thereof, the sEH inhibitor having a structure according to formula i:

the composition in the pharmaceutically acceptable composition comprises one or more of deuteron and hydrate.

2. A process for preparing a sEH inhibitor according to claim 1, comprising the steps of:

mixing the compound II, a chlorination reagent, a catalyst and a soluble compound II solvent, and then carrying out chlorination reaction to obtain an acyl chloride intermediate; mixing the acyl chloride intermediate, an ammonia solution, ice and a soluble acyl chloride intermediate solution, and carrying out an acylation reaction to obtain an sEH inhibitor with a structure shown in a formula I;

3. the process according to claim 2, wherein the molar ratio of the compound II, the chlorinating agent and the ammonia in the ammonia solution is 1: 1.05-2: 5 to 20.

4. The preparation method according to claim 2 or 3, characterized in that the temperature of the chlorination reaction is 0-80 ℃ and the time is 0.5-6 h;

the temperature of the acylation reaction is-10-0 ℃, and the time is 2-10 h.

5. The process according to claim 2, wherein the compound ii is prepared by a process comprising the steps of:

(1) mixing a compound 1, ethyl (S) -piperidine-3-formate, organic base and a solvent of a soluble compound 1, and carrying out acylation reaction to obtain a compound 2;

(2) mixing the compound 2, a metal reducing agent, an acidic reagent and a soluble compound 2 solvent, and then carrying out reduction reaction to obtain a compound 3;

(3) mixing the compound 3, solid phosgene, organic base and a soluble compound 3 solvent, and then carrying out nucleophilic substitution-elimination reaction to obtain an isocyanate intermediate solution; mixing the isocyanate intermediate solution, memantine and a soluble memantine solvent, and then carrying out nucleophilic substitution reaction to obtain a compound 4;

(4) hydrolyzing the compound 4 to obtain a compound II;

6. the method according to claim 5, wherein in step (1), the molar ratio of compound 1 to ethyl (S) -piperidine-3-carboxylate is 1:1 to 1.5; the temperature of the acylation reaction is 0-40 ℃, and the time is 0.1-6 h;

in the step (2), the metal reducing agent comprises iron and/or zinc; the molar ratio of the compound 2 to the metal reducing agent is 1: 3.3 to 5; the temperature of the reduction reaction is 50-100 ℃, and the time is 0.1-6 h;

in the step (3), the molar ratio of the compound 3, the phosgene solid and the memantine is 1: 0.34-1: 1 to 1.5; the temperature of the nucleophilic substitution-elimination reaction is-10-30 ℃, and the time is 0.5-4 h; the temperature of the nucleophilic substitution reaction is-10-30 ℃, and the time is 0.5-4 h.

7. Use of a sEH inhibitor according to claim 1 or a pharmaceutically acceptable composition thereof or a sEH inhibitor prepared by the preparation method according to any one of claims 2-6 in the preparation of a medicament for treating a sEH-mediated disease.

8. The use of claim 7, wherein the sEH-mediated disease comprises pain, inflammation, cardiovascular disease, neurodegenerative disease, metabolic disease, or renal disease.

9. The use of claim 8, wherein the pain comprises neuropathic pain, inflammatory pain, or cancerous pain;

the inflammation comprises sepsis, neuroinflammation, inflammatory bowel disease, chronic peptic ulcer or arthritis;

the cardiovascular disease comprises hypertension, cardiomyopathy, stroke or atherosclerosis;

the neurodegenerative disease includes parkinsonism, alzheimer's disease, huntington's disease, or amyotrophic lateral sclerosis;

the metabolic disease includes diabetes or gout.

Background

Soluble epoxide hydrolase (sEH) is widely expressed in mammalian tissues, especially in the liver, kidney, lung, gut and blood vessels. The sEH inhibitor can stabilize endogenous substances epoxy fatty acids (EETs) with wide physiological activity, the EETs are endogenous lipid epoxy compounds with strong biological activity, are used as main components of endothelium-derived super-activation factors, have the effects of resisting inflammation, easing pain, resisting apoptosis, resisting fibrosis and resisting ischemia, and simultaneously show the protective effect on organs such as heart, lung, kidney, brain and the like. Thus, sEH inhibitors are of widespread interest.

Currently, the central pharmacophores of sEH inhibitors include, but are not limited to, amides, carbamates, and ureas. Residence time of sEH inhibitor on target enzyme (t)_1/2) Is one of the most important parameters influencing the in vivo efficacy, the inhibitor with long retention time has long action time on target enzyme, and the in vivo transformation efficacy is long. However, the above sEH inhibitors have short residence time and poor in vivo efficacy.

Disclosure of Invention

The sEH inhibitor provided by the invention has long in-vivo retention time, and a medicament containing the sEH inhibitor has excellent treatment effect on sET-mediated diseases.

In order to achieve the above object, the present invention provides the following technical solutions:

the invention provides a sEH inhibitor or a pharmaceutically acceptable composition thereof, wherein the sEH inhibitor has a structure shown as a formula I:

the composition in the pharmaceutically acceptable composition comprises one or more of deuteron and hydrate.

The invention provides a preparation method of the sEH inhibitor in the technical scheme, which comprises the following steps:

mixing the compound II, a chlorination reagent, a catalyst and a soluble compound II solvent, and then carrying out chlorination reaction to obtain an acyl chloride intermediate; mixing the acyl chloride intermediate, an ammonia solution, ice and a soluble acyl chloride intermediate solution, and carrying out an acylation reaction to obtain an sEH inhibitor with a structure shown in a formula I;

preferably, the molar ratio of the compound II, the chlorinated reagent and ammonia in the ammonia solution is 1: 1.05-2: 5 to 20.

Preferably, the temperature of the chlorination reaction is 0-80 ℃, and the time is 0.5-6 h;

the temperature of the acylation reaction is-10-0 ℃, and the time is 2-10 h.

Preferably, the preparation method of the compound II comprises the following steps:

(1) mixing a compound 1, ethyl (S) -piperidine-3-formate, organic base and a solvent of a soluble compound 1, and carrying out acylation reaction to obtain a compound 2;

(2) mixing the compound 2, a metal reducing agent, an acidic reagent and a soluble compound 2 solvent, and then carrying out reduction reaction to obtain a compound 3;

(3) mixing the compound 3, solid phosgene, organic base and a soluble compound 3 solvent, and then carrying out nucleophilic substitution-elimination reaction to obtain an isocyanate intermediate solution; mixing the isocyanate intermediate solution, memantine and a soluble memantine solvent, and then carrying out nucleophilic substitution reaction to obtain a compound 4;

(4) hydrolyzing the compound 4 to obtain a compound II;

preferably, in step (1), the molar ratio of compound 1 to ethyl (S) -piperidine-3-carboxylate is 1:1 to 1.5; the temperature of the acylation reaction is 0-40 ℃, and the time is 0.1-6 h;

in the step (2), the metal reducing agent comprises iron and/or zinc; the molar ratio of the compound 2 to the metal reducing agent is 1: 3.3 to 5; the temperature of the reduction reaction is 50-100 ℃, and the time is 0.1-6 h;

in the step (3), the molar ratio of the compound 3, the phosgene solid and the memantine is 1: 0.34-1: 1 to 1.5; the temperature of the nucleophilic substitution-elimination reaction is-10-30 ℃, and the time is 0.5-4 h; the temperature of the nucleophilic substitution reaction is-10-30 ℃, and the time is 0.5-4 h.

The invention provides an application of the sEH inhibitor or the pharmaceutically acceptable composition thereof or the sEH inhibitor prepared by the preparation method in the technical scheme in the preparation of a medicament for treating sEH mediated diseases.

Preferably, the sEH-mediated disease includes pain, inflammation, cardiovascular disease, neurodegenerative disease, metabolic disease, or renal disease.

Preferably, the pain comprises neuropathic pain, inflammatory pain or cancer pain;

the inflammation comprises sepsis, neuroinflammation, inflammatory bowel disease, chronic peptic ulcer or arthritis;

the cardiovascular disease comprises hypertension, cardiomyopathy, stroke or atherosclerosis;

the neurodegenerative disease includes parkinsonism, alzheimer's disease, huntington's disease, or amyotrophic lateral sclerosis;

the metabolic disease includes diabetes or gout.

The invention provides a sEH inhibitor or a pharmaceutically acceptable composition thereof, wherein the sEH inhibitor has a structure shown in a formula I and has a chemical name of (S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-formamide. The opioid pain-relieving medicine can be combined with peripheral nerve opioid receptors, can also be combined with opioid receptors in spinal cord dorsal horn colloidal (second layer) sensory neurons in a human body, and can inhibit the release of P substances, so that pain sensation is effectively prevented from being transmitted into the brain; opioids can also act on the pain central system in the brain and brain stem of the human body, thus exerting a strong inhibitory effect on descending pain. The non-steroidal anti-inflammatory drug mainly has the effects of reducing the generation of inflammatory mediator prostaglandin by inhibiting cyclooxygenase, and generating anti-inflammatory, analgesic and antipyretic effects. The ion channel plays a key role in pain generation and pain treatment, is a main target point for regulating neuropathic pain, and the antiepileptic drug mainly acts on the ion channel to reduce the excitability of neurons, increase the membrane stability and further regulate the over-discharge of the neurons, thereby reducing the pain. The sEH inhibitor provided by the invention can stabilize endogenous substances epoxy fatty acids (EETs) with wide physiological activity, has strong inhibiting effect on human recombinant sEH, can obviously relieve neuropathic pain by regulating the generation of various proinflammatory cytokines, relieving endoplasmic reticulum stress, preventing or reversing endothelial dysfunction and stabilizing various action mechanisms of mitochondrial function, and has completely different action mechanisms from opioid analgesics, non-steroidal anti-inflammatory drugs, antiepileptic drugs and the like; the sEH inhibitor provided by the invention can effectively avoid adverse reactions related to target spots. Moreover, the sEH inhibitor provided by the invention does not contain free carboxyl in the structure, so that adverse reactions such as gastrointestinal irritation and the like caused by oral administration can be avoided; in addition, the sEH inhibition structure shown in the formula I provided by the invention contains fluorine atoms, so that the metabolic stability of the compound can be improved; in addition, 3, 5-dimethyl in the memantine structure can enhance the binding with sEH, and the metabolic stability is superior to that of the adamantane structure, so that the structure shown in the formula I is analyzed to have longer in-vivo retention time.

As shown in the example results, the half inhibitory concentration of the sEH inhibitor provided by the invention on the recombinant human sEH is nanomolar; half-life (t) in human and rat liver microsomes_1/2) 174min and 120min respectively, and long in-vivo retention time; the oral administration of 6g/kg in mice does not show any toxicity and adverse reaction; after the sEH inhibitor of 10mg/kg is administered to SD rats by intravenous injection for 7min, the blood concentration of the sEH inhibitor reaches the peak value of 667631.2 ng/L; time of drug curve AUC_0-4The total exposure amount of the drug is 561131.7 ng.h/L, and the half-life period is 0.795 h; after oral administration of 50mg/kg to SD rats, the peak is reachedTime 2 hours, time of drug curve AUC_0-4The total exposure is 884275.33 ng.h/L, and the half-life is 2.228 h; the absolute bioavailability of sEH inhibitors was 31.52%; the medicine has strong analgesic effect in a neuropathic pain model of a rat, the effect is faster than that of gabapentin, the analgesic effect after continuous administration is better than that of gabapentin, and the molar administration dose is only one sixth of that of gabapentin. The sEH inhibitor provided by the invention has long retention time in vivo and long in vivo efficacy, and the medicament containing the sEH inhibitor has excellent treatment effect on sEH mediated diseases; furthermore, sEH inhibitors have low side effects, high bioavailability, excellent analgesic effects and low dosage.

The preparation method of the sEH inhibitor or the pharmaceutically acceptable composition thereof provided by the invention is simple to operate, high in yield and suitable for industrial production.

Drawings

FIG. 1 is a graph of the time course of the drug after tail vein injection and gavage in test example 3;

FIG. 2 is a comparison of body weights of mice in a control group and a drug-administered group in test example 4;

FIG. 3 is a comparison result of paw withdrawal thresholds in test example 5, wherein a is a comparison result of paw withdrawal thresholds of a control group and each administration group, and b is a comparison result of paw withdrawal thresholds of a control group and each administration group before administration;

FIG. 4 is a graph showing the results of comparing paw contraction thresholds of the model group and each administration group in test example 5;

fig. 5 is a graph showing the drug aging after the last administration in test example 5.

Detailed Description

The invention provides a sEH inhibitor or a pharmaceutically acceptable composition thereof, wherein the sEH inhibitor has a structure shown as a formula I:

in the invention, the composition in the pharmaceutically acceptable composition comprises one or more of deuterons and hydrates, and preferably comprises pharmaceutically acceptable deuterons and pharmaceutically acceptable hydrates. In the present invention, the deuteron is preferably a hydrogen atom on the carbamoyl group, piperidine ring and 3, 5-dimethyl group in formula I substituted with deuterium. In the invention, the pharmaceutically acceptable hydrate is preferably 1-5 hydrate.

The invention provides a preparation method of the sEH inhibitor in the technical scheme, which comprises the following steps:

mixing the compound II, a chlorination reagent, a catalyst and a soluble compound II solvent, and then carrying out chlorination reaction to obtain an acyl chloride intermediate; mixing the acyl chloride intermediate, an ammonia solution, ice and a soluble acyl chloride intermediate solution, and carrying out an acylation reaction to obtain an sEH inhibitor with a structure shown in a formula I;

in the present invention, all the raw material components are commercially available products well known to those skilled in the art unless otherwise specified.

In the present invention, the preparation method of the compound ii preferably comprises the following steps:

(1) mixing a compound 1, ethyl (S) -piperidine-3-formate, organic base and a solvent of a soluble compound 1, and carrying out acylation reaction to obtain a compound 2;

(2) mixing the compound 2, a metal reducing agent, an acidic reagent and a soluble compound 2 solvent, and then carrying out reduction reaction to obtain a compound 3;

(3) mixing the compound 3, solid phosgene, organic base and a soluble compound 3 solvent, and then carrying out nucleophilic substitution-elimination reaction to obtain an isocyanate intermediate solution; mixing the isocyanate intermediate solution, memantine and a soluble memantine solvent, and then carrying out nucleophilic substitution reaction to obtain a compound 4;

(4) hydrolyzing the compound 4 to obtain a compound II;

the invention mixes the compound 1, the (S) -piperidine-3-ethyl formate, the organic base and the solvent of the soluble compound 1 and then carries out acylation reaction to obtain the compound 2((S) -1- (4-nitro-3-fluorobenzoyl) piperidine-3-ethyl formate).

In the present invention, the preparation method of the compound 1 (3-fluoro-4-nitrobenzoyl chloride) preferably comprises the following steps: mixing 3-fluoro-4-nitrobenzoic acid, a catalyst, a chlorination reagent and a soluble 3-fluoro-4-nitrobenzoic acid solvent, and carrying out chlorination reaction to obtain the compound 1 (3-fluoro-4-nitrobenzoyl chloride).

In the present invention, the catalyst preferably comprises a lewis acid and/or lewis base; the Lewis acid preferably comprises one or more of zinc chloride, aluminum trichloride, boron trifluoride, ferric trichloride and stannic chloride; the lewis base preferably comprises one or more of N, N-dimethylformamide, pyridine and 4-dimethylaminopyridine. In the invention, the chlorinating reagent preferably comprises one or more of thionyl chloride, oxalyl chloride, phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride. In the present invention, the molar ratio of the 3-fluoro-4-nitrobenzoic acid, the catalyst and the chlorinating agent is preferably 1: 1.05-3: 0.001 to 0.2, more preferably 1: 1.1-1.5: 0.001 to 0.1. In the present invention, the soluble 3-fluoro-4-nitrobenzoic acid solvent preferably comprises dichloromethane, chloroform, toluene, tetrahydrofuran or a chlorinating agent; the soluble 3-fluoro-4-nitrobenzoic acid solvent is preferably a dry soluble 3-fluoro-4-nitrobenzoic acid solvent; the dosage of the soluble 3-fluoro-4-nitrobenzoic acid solvent is not specially limited, and the soluble 3-fluoro-4-nitrobenzoic acid solvent can be dissolved; in the examples of the present invention, the amount of the substance of 3-fluoro-4-nitrobenzoic acid and 0.14mol of the soluble 3-fluoro-4-nitrobenzoic acid solvent: 200 mL.

In the present invention, the order of mixing is preferably to mix 3-fluoro-4-nitrobenzoic acid, a catalyst and a partially soluble 3-fluoro-4-nitrobenzoic acid solvent to obtain a mixed solution; mixing the chlorination reagent with the residual soluble 3-fluoro-4-nitrobenzoic acid solvent to obtain a 3-fluoro-4-nitrobenzoic acid solution; dropwise adding the 3-fluoro-4-nitrobenzoic acid solution to the mixed solution; the dosage of the partially soluble 3-fluoro-4-nitrobenzoic acid solvent is not specially limited, and the 3-fluoro-4-nitrobenzoic acid can be dissolved; in an embodiment of the invention, the ratio between the amount of the substance of 3-fluoro-4-nitrobenzoic acid and the volume of the partially soluble 3-fluoro-4-nitrobenzoic acid solvent is preferably 0.14 mol: 150 mL; the dosage of the residual soluble 3-fluoro-4-nitrobenzoic acid solvent is not specially limited, and the chlorinated reagent can be dissolved; in an embodiment of the invention, the ratio between the amount of substance of the chlorinating reagent and the volume of the remaining soluble 3-fluoro-4-nitrobenzoic acid solvent is preferably 0.16 mol: 50 mL. The dropping speed is not specially limited, and the dropping can be carried out at a constant speed. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed.

In the invention, the temperature of the chlorination reaction is preferably 0-80 ℃, and more preferably 30-60 ℃; the time of the chlorination reaction is preferably 0.1-6 h, and more preferably 1-2 h; in the chlorination reaction process, 3-fluoro-4-nitrobenzoic acid reacts with a chlorination reagent to generate a compound 1.

After the chlorination reaction, the method preferably further comprises the step of concentrating a system of the chlorination reaction to constant weight to obtain a compound 1; the concentration is preferably carried out by distillation under reduced pressure.

In the present invention, the molar ratio of the compound 1 and ethyl (S) -piperidine-3-carboxylate is preferably 1:1 to 1.5, more preferably 1: 1.2 to 1.3. In the present invention, the organic base preferably includes one or more of triethylamine, N-diisopropylethylamine, pyridine, and 4-dimethylaminopyridine. In the present invention, the molar ratio of the compound 1 and the organic base is preferably 1: 2-4, more preferably 1: 2.5 to 3. In the present invention, the soluble compound 1 solvent preferably includes dichloromethane, chloroform, toluene or tetrahydrofuran; the amount of the solvent for the soluble compound 1 is not particularly limited, and the compound 1 can be dissolved; in the present example, the ratio between the amount of substance of compound 1 and the volume of partially soluble 3-fluoro-4-nitrobenzoic acid solvent is preferably 0.14 mol: 250 mL.

In the present invention, the compound 1, ethyl (S) -piperidine-3-carboxylate, organic base and soluble compound 1 solvent are preferably mixed by dissolving the compound 1 in a partially soluble compound 1 solvent to obtain a compound 1 solution; mixing (S) -piperidine-3-ethyl formate, organic base and the residual soluble compound 1 solvent to obtain a mixed solution; the compound 1 solution was added dropwise to the mixed solvent. The amount of the solvent for the partially soluble compound 1 used in the present invention is not particularly limited, and the compound 1 may be dissolved; in the present example, the ratio between the amount of substance of compound 1 and the volume of partially soluble compound 1 solvent is preferably 0.14 mol: 100 mL; the dosage of the solvent of the residual soluble compound 1 is not particularly limited, and the (S) -piperidine-3-ethyl formate can be dissolved; in the examples of the present invention, the ratio of the amount of the substance of the ethyl (S) -piperidine-3-carboxylate to the volume of the remaining soluble compound 1 solvent is preferably 0.14 mol: 50 mL. The dropping speed is not specially limited, and the dropping can be carried out at a constant speed. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed.

In the invention, the temperature of the acylation reaction is preferably 0-40 ℃, and more preferably room temperature; the time of the acylation reaction is preferably 0.1-6 h, and more preferably 0.5-1 h. In the present invention, the reaction occurring during the acylation reaction is as follows:

after the acylation reaction, the method preferably further comprises the steps of carrying out solid-liquid separation on a system of the acylation reaction to obtain a liquid component and a solid component; and (3) washing the obtained solid product to be colorless, sequentially carrying out concentration, water extraction and organic solvent extraction on a liquid component obtained by solid-liquid separation and a liquid component obtained by washing, combining organic phases, sequentially carrying out hydrochloric acid solution washing, water washing and saturated salt water washing, and concentrating the obtained organic phase to constant weight to obtain the compound 2. In the present invention, the concentration is preferably performed by distillation under reduced pressure. In the present invention, the ratio of the amount of the substance of ethyl (S) -piperidine-3-carboxylate to the volume of the extraction water is preferably 0.14 mol: 200 mL. In the present invention, the organic solvent for organic solvent extraction preferably includes dichloromethane, chloroform, toluene or tetrahydrofuran; the number of times of the organic solvent extraction is preferably 2-3; the ratio of the amount of the substance of ethyl (S) -piperidine-3-carboxylate to the volume of the organic solvent for a single extraction is preferably 0.14 mol: 250 mL. In the invention, the concentration of the hydrochloric acid solution is preferably 1-6 mol/L, and more preferably 1 mol/L; the ratio of the amount of the substance of ethyl (S) -piperidine-3-carboxylate to the volume of the hydrochloric acid solution is preferably 0.14 mol: 270 mL. In the present invention, the ratio of the amount of the substance of ethyl (S) -piperidine-3-carboxylate to the volume of water for washing with water is preferably 0.14 mol: 200 mL. In the present invention, the ratio of the amount of the substance of ethyl (S) -piperidine-3-carboxylate to the volume of the saturated saline solution is preferably 0.14 mol: 200 mL.

After the compound 2 is obtained, the compound 2, a metal reducing agent, an acidic reagent and a soluble compound 2 solvent are mixed and then subjected to reduction reaction to obtain a compound 3((S) -1- (4-3-fluoroanilinoyl) piperidine-3-ethyl formate).

In the present invention, the metal reducing agent preferably includes iron and/or zinc; the acidic reagent preferably comprises one or more of ammonium chloride, acetic acid and hydrochloric acid; the hydrochloric acid is preferably used in the form of a hydrochloric acid solution; the concentration of the hydrochloric acid solution is preferably 0.1-6, and more preferably 0.5-1. In the present invention, the molar ratio of the compound 2, the metal reducing agent and the acidic reagent is 1: 3.3-5: 5-20, more preferably 1: 4-4.5: 10 to 15. In the present invention, the soluble compound 2 solvent is preferably an alcohol aqueous solution; the alcohol in the alcohol aqueous solution preferably comprises methanol and/or ethanol, and the volume ratio of the alcohol to the water in the alcohol aqueous solution is preferably 1: 0.3 to 2, more preferably 1: 0.8 to 1.2. The amount of the solvent for the partially soluble compound 1 is not particularly limited in the present invention, and the compound 2 can be dissolved; in the embodiment of the present invention, the ratio of the amount of the substance of the compound 2 to the volume of the solvent of the soluble compound 2 is preferably 0.14 mol: 400 mL. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed.

In the invention, the temperature of the reduction reaction is preferably 50-100 ℃, and more preferably 60-80 ℃; the reduction reaction time is preferably 0.1-6 h, and more preferably 0.25-1 h. In the present invention, the reaction occurring during the reduction reaction is as follows:

after the reduction reaction, the method preferably further comprises the steps of cooling a system of the reduction reaction to room temperature, carrying out suction filtration on diatomite to obtain a filtrate and a filter cake, and carrying out alcohol washing on the filter cake to obtain an alcohol washing solution; combining the filtrate and the alcohol washing solution, and then concentrating under reduced pressure to remove alcohol; and sequentially carrying out organic solvent extraction, water washing, saturated salt water washing, drying of a drying agent, suction filtration to remove the drying agent, reduced pressure concentration and silica gel column chromatography purification on the obtained concentrate to obtain a compound 3. In the invention, the granularity of the diatomite for suction filtration is preferably 200-300 meshes. In the present invention, the alcohol washing alcohol preferably includes ethanol, methanol or isopropanol; the alcohol washing mode is preferably alcohol washing; the ratio of the amount of substance of the compound 2 to the volume of alcohol is preferably 0.14 mol: 50 mL. In the present invention, the organic solvent for extraction preferably includes ethyl acetate, dichloromethane, methyl isobutyl ketone or n-butanol; the number of times of the organic solvent extraction is preferably 2-3; the ratio of the amount of the substance of the compound 2 to the volume of the organic solvent is preferably 0.14 mol: 200 mL. In the present invention, the ratio of the amount of the substance of the compound 2 to the volume of water for washing is preferably 0.14 mol: 200 mL. In the present invention, the ratio of the amount of the substance of the compound 2 to the volume of the saturated saline solution is preferably 0.14 mol: 200 mL. The drying agent in the present invention preferably includes anhydrous sodium sulfate or anhydrous magnesium sulfate. In the present invention, in the purification process by silica gel column chromatography, the mass ratio of the crude product to the silica gel for loading is preferably 1: 1-3, more preferably 1:1.5, and the mass ratio of the crude product to silica gel loaded in the silica gel column is preferably 1: 2-10, more preferably 1: 5; in the present invention, the eluent used for the silica gel column chromatography purification is preferably Ethyl Acetate (EA) and Petroleum Ether (PE), and the volume ratio of ethyl acetate to petroleum ether is preferably 1:1 to 20, and more preferably 1: 5.

After the compound 3 is obtained, the compound 3, solid phosgene, organic base and a soluble compound 3 solvent are mixed and then subjected to nucleophilic substitution-elimination reaction to obtain an isocyanate intermediate solution; the isocyanate intermediate solution, memantine and soluble memantine solvent were mixed and nucleophilic substituted to give compound 4((S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-carboxylic acid ethyl ester).

After the compound 3 is obtained, the compound 3, the solid phosgene, the organic base and the soluble compound 3 are mixed and subjected to nucleophilic substitution-elimination reaction to obtain an isocyanate intermediate solution. In the present invention, the organic base preferably includes one or more of triethylamine, N-diisopropylethylamine, pyridine, and 4-dimethylaminopyridine. In the present invention, the molar ratio of the compound 3, the phosgene solid, the organic base and the memantine is 1: 0.34-1: 4-10: 1 to 1.5, more preferably 1: 0.5-0.8: 5-8: 1.2 to 1.3. In the present invention, the soluble compound 3 solvent preferably includes dichloromethane, chloroform, acetone, acetonitrile, toluene or tetrahydrofuran; the soluble compound 3 solvent is preferably a dry solvent; the amount of the solvent for the soluble compound 3 is not particularly limited, and the compound 3 can be dissolved; in an embodiment of the present invention, the ratio of the amount of the substance of compound 3 to the volume of the solvent for soluble compound 3 is preferably 0.076 mol: 800 mL. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed. In the present invention, the order of mixing is preferably to dissolve the phosgene solids in the first partially soluble compound 3 solvent to obtain a phosgene solids solution; dissolving an organic base in the second part soluble compound 3 solvent to obtain an organic base solution; dissolving the compound 3 in the residual soluble compound 3 solvent, cooling to below 0 ℃ in an ice salt bath, adding a solid phosgene solution, and then dropwise adding an organic alkali solution. In the present invention, the ratio of the amount of the solid phosgene substance to the first partially soluble compound 3 solvent volume is preferably 0.038 mol: 100 mL; the ratio between the amount of substance of the organic base and the volume of the second fraction of soluble compound 3 solvent is preferably 0.46 mol: 100 mL; the ratio of the amount of the substance of the compound 3 to the volume of the remaining soluble compound 3 solvent is preferably 0.076 mol: 600 mL. In the invention, the temperature after cooling is preferably-20-0 ℃; the salt in the ice salt bath is not particularly limited, and the temperature of the ice salt bath can reach-20 ℃, specifically sodium chloride. In the invention, the temperature of the carbonylation reaction is preferably-10-30 ℃, and more preferably-5-0 ℃; the nucleophilic substitution-elimination time is preferably 0.5-4 h, and more preferably 1-3 h.

After the isocyanate intermediate solution is obtained, the isocyanate intermediate solution, memantine and a soluble memantine solvent are mixed and then subjected to nucleophilic substitution to obtain a compound 4. In the present invention, the soluble memantine solvent preferably comprises dichloromethane, chloroform, acetone, acetonitrile, toluene or tetrahydrofuran; the ratio of the mass of memantine to the volume of soluble memantine solvent is preferably 0.076 mol: 100 mL. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed. In the invention, the temperature of nucleophilic substitution is preferably-10-30 ℃, and more preferably-5-0 ℃; the nucleophilic substitution time is preferably 0.5-4 h, and more preferably 1-3 h. In the present invention, the reactions occurring during the nucleophilic substitution-elimination and nucleophilic substitution are as follows:

after the urea-forming reaction, the invention concentrates the urea-forming reaction system to constant weight to obtain compound 4. In the present invention, the concentration is preferably performed by distillation under reduced pressure.

After compound 4 is obtained, the present invention hydrolyzes said compound 4 to obtain compound II ((S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-carboxylic acid).

In the present invention, the hydrolysis is preferably carried out in the presence of an inorganic base, which preferably comprises a hydroxide and/or a carbonate; the hydroxide preferably comprises one or more of lithium hydroxide, sodium hydroxide and potassium hydroxide; the carbonate preferably comprises potassium carbonate and/or sodium carbonate. In the present invention, the molar ratio of the compound 4 to the inorganic base is preferably 1: 3-20, more preferably 1:5 to 10. In the present invention, the solvent for hydrolysis preferably includes a mixed solvent of an organic solvent/water; the organic solvent in the mixed solvent preferably comprises methanol, ethanol, tetrahydrofuran, acetone or acetonitrile; the volume ratio of the organic solvent to water in the mixed solvent is preferably 1: 0.2 to 5, more preferably 1: 1-3; the amount of the solvent for hydrolysis is not particularly limited, and the compound 4 can be dissolved; in the present example, the ratio between the amount of substance of compound 4 and the volume of solvent for hydrolysis is preferably 0.079 mol: 400 mL.

In the invention, the temperature of the hydrolysis reaction is preferably 5-100 ℃, and more preferably 20-50 ℃; the time of the hydrolysis reaction is preferably 0.5-5 h, and more preferably 1-2 h. In the present invention, during the hydrolysis reaction, the reactions that occur are as follows:

after the hydrolysis reaction, the method preferably comprises the steps of concentrating a system of the hydrolysis reaction, adding water into the obtained concentrate, cooling the obtained concentrate to below 0 ℃ in an ice salt bath, carrying out solid-liquid separation after acidification, washing the obtained solid product with water, and drying to obtain the compound II. In the present invention, the ratio of the amount of the substance of the compound 4 to the volume of the added water is preferably 0.079 mol: 500 mL. In the invention, the temperature after cooling is preferably-20-0 ℃; the salt in the ice salt bath is not particularly limited, and the temperature of the ice salt bath can reach-20 ℃, specifically sodium chloride. In the present invention, the inorganic acid used for the acidification preferably includes hydrochloric acid, sulfuric acid or phosphoric acid; the acid is preferably used in the form of an acid solvent; the concentration of the acid solution is preferably 0.5-12 mol/L, and more preferably 6 mol/L; the pH value after acidification is preferably 1-6, and more preferably 3. The solid-liquid separation mode is not particularly limited, and a solid-liquid separation mode known to those skilled in the art can be adopted, such as suction filtration. In the present invention, the water washing is preferably water rinsing; the ratio of the amount of the substance of the compound 4 to the volume of the water for washing is preferably 0.079 mol: 100 mL. In the invention, the drying temperature is preferably 10-40 ℃, and more preferably 20-30 ℃; the drying time is preferably 1-12 h, and more preferably 4-8 h.

After a compound II is obtained, the compound II, a chlorination reagent, a catalyst and a soluble compound II solvent are mixed and subjected to chlorination reaction to obtain an acyl chloride intermediate; and (3) mixing the acyl chloride intermediate, an ammonia solution, ice and a soluble acyl chloride intermediate solution, and carrying out acylation reaction to obtain the sEH inhibitor ((S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyl adamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-formamide) with the structure shown in the formula I.

After the compound II is obtained, the compound II, a chlorination reagent, a catalyst and a soluble compound II solvent are mixed and subjected to chlorination reaction to obtain an acyl chloride intermediate. In the invention, the chlorinating reagent preferably comprises one or more of thionyl chloride, oxalyl chloride, phosphorus oxychloride, phosphorus trichloride and phosphorus pentachloride. In the present invention, the catalyst preferably comprises a lewis acid and/or lewis base; the Lewis acid preferably comprises one or more of zinc chloride, aluminum trichloride, boron trifluoride, ferric trichloride and stannic chloride; the lewis base preferably comprises one or more of N, N-Dimethylformamide (DMF), pyridine and 4-dimethylaminopyridine. In the present invention, the molar ratio of the compound ii, the chlorinating agent and the catalyst is preferably 1: 1.05-2: 0.001 to 0.01, more preferably 1: 1.2-1.5: 0.005-0.008. In the present invention, the soluble compound ii solvent preferably includes a solvent preferably including a chlorinated hydrocarbon solvent, a heterocyclic solvent or a nitrile solvent; the chlorinated hydrocarbon solvent preferably comprises dichloromethane or chloroform; the heterocyclic solvent preferably comprises tetrahydrofuran or dioxane; the nitrile solvent preferably comprises acetonitrile; the soluble compound II solvent is preferably a dry solvent; the dosage of the soluble compound II solvent is not particularly limited, and the compound II can be dissolved; in the examples of the present invention, the amount of the substance of the compound II and 0.075mol of the solvent soluble in the compound II: 280 mL. In the present invention, the order of mixing is preferably to mix the compound ii, the catalyst and the partially soluble compound ii solvent to obtain a mixed solution; mixing the chlorinated reagent and the residual soluble compound II solvent to obtain a compound II solution; dropwise adding the compound II solution into the mixed solution; the amount of the solvent for the partially soluble compound II is not particularly limited, and the compound II can be dissolved; in the present examples, the ratio of the amount of the substance of the compound II to the volume of the partially soluble compound II solvent is preferably 0.075 mol: 250 mL; the dosage of the solvent of the residual soluble compound II is not specially limited, and the chlorinated reagent can be dissolved; in the examples of the invention, the ratio between the quantity of substance of the chlorinating reagent and the volume of solvent of the remaining soluble compound II is preferably 0.094 mol: 50 mL. The dropping speed is not specially limited, and the dropping can be carried out at a constant speed. In the present invention, the mixing method is preferably stirring mixing, and the speed and time of stirring mixing are not particularly limited in the present invention, and the raw materials may be uniformly mixed. In the invention, the temperature of the chlorination reaction is preferably 0-80 ℃, and more preferably room temperature; the time of the chlorination reaction is preferably 0.1-6 h, and more preferably 1-2 h; in the chlorination reaction process, the compound II reacts with a chlorination reagent to generate an acyl chloride intermediate. After the chlorination reaction, the method preferably further comprises the step of concentrating a system of the chlorination reaction to constant weight to obtain an acyl chloride intermediate; the concentration is preferably carried out by distillation under reduced pressure.

Obtaining acyl chloride intermediate; and mixing the acyl chloride intermediate, an ammonia solution, ice and a soluble acyl chloride intermediate solution, and carrying out acylation reaction to obtain the sEH inhibitor with the structure shown in the formula I. In the present invention, the solvent in the ammonia solution preferably includes water, an alcohol solvent, an ether solvent, a chlorinated hydrocarbon solvent, an ester solvent, a heterocyclic solvent, a nitrile solvent or a ketone solvent; the alcohol solvent preferably comprises methanol or ethanol; the ether solvent preferably includes diethyl ether; the chlorinated hydrocarbon solvent preferably comprises dichloromethane or chloroform; the ester solvent preferably comprises ethyl acetate; the heterocyclic solvent preferably comprises tetrahydrofuran or dioxane; the nitrile solvent preferably comprises acetonitrile; the ketone solvent preferably includes acetone; the mass concentration of the ammonia solution is preferably 5-28%, and more preferably 10-20%. In the present invention, the molar ratio of the compound ii to ammonia in the ammonia solution is preferably 1: 5-20, more preferably 1:10 to 15. In the present invention, the soluble acid chloride intermediate solvent preferably comprises a chlorinated hydrocarbon solvent or a heterocyclic solvent; the chlorinated hydrocarbon solvent preferably comprises dichloromethane or chloroform; the heterocyclic solvent preferably comprises tetrahydrofuran or dioxane; the soluble acid chloride intermediate solvent is preferably a dry solvent; the dosage of the acyl chloride intermediate solvent is not specially limited, and the acyl chloride intermediate can be dissolved; in an embodiment of the invention, the ratio of the amount of the species of the acid chloride intermediate to the volume of the soluble acid chloride intermediate solvent is preferably 0.075 mol: 200 mL. In the invention, the mixing mode is preferably stirring mixing, the speed and time of stirring mixing are not particularly limited, and the raw materials can be uniformly mixed; the mixing sequence is preferably that the acyl chloride intermediate solvent is dissolved in the soluble acyl chloride intermediate solvent to obtain the acyl chloride intermediate solution; cooling the ammonia solution and ice to 0 ℃ in an ice bath, and then dropwise adding the acyl chloride intermediate solution; the dropping speed is not specially limited, and the dropping can be carried out at a constant speed. In the invention, the temperature of the urea-forming reaction is preferably-10-0 ℃, and more preferably-5-2 ℃; the time for the urea-forming reaction is preferably 2-10 hours, and more preferably 5-8 hours. In the present invention, the reactions occurring during the chlorination and urea-forming reactions are as follows:

after the acylation reaction, the invention preferably further comprises the steps of layering the system of the acylation reaction, concentrating the obtained organic phase to constant weight, adding water into the obtained concentrate for stirring, carrying out solid-liquid separation, drying the obtained solid product, and purifying the obtained crude product by silica gel column chromatography to obtain the sEH inhibitor with the structure shown in the formula I. In the present invention, the concentration is preferably performed by distillation under reduced pressure. In the present invention, the ratio of the amount of the substance of the compound II to the volume of the added water is preferably 0.075 mol: 500 mL; the stirring speed and time are not particularly limited, the liquid can be uniformly dispersed, and the liquid does not splash. The solid-liquid separation mode is not particularly limited, and a solid-liquid separation mode known to those skilled in the art can be adopted, such as suction filtration. In the invention, the drying temperature is preferably 10-40 ℃, and more preferably 20-30 ℃; the drying time is preferably 1-12 h, and more preferably 4-8 h. In the present invention, in the purification process by silica gel column chromatography, the mass ratio of the crude product to the silica gel for loading is preferably 1: 1-3, more preferably 1:1.5, and the mass ratio of the crude product to silica gel loaded in the silica gel column is preferably 1: 2-10, more preferably 1: 5; the eluent adopted for silica gel column chromatography purification is preferably Ethyl Acetate (EA) and Petroleum Ether (PE), and the volume ratio of ethyl acetate to petroleum ether is preferably 1:1 to 20, and more preferably 1:5 to 10.

The invention provides an application of the sEH inhibitor or the pharmaceutically acceptable composition thereof in the technical scheme or the sEH inhibitor or the pharmaceutically acceptable composition thereof prepared by the preparation method in the technical scheme in the preparation of a medicament for treating sEH mediated diseases.

In the present invention, the sEH mediated disease preferably includes pain, inflammation, cardiovascular disease, neurodegenerative disease, metabolic disease or renal disease. In the present invention, the pain includes neuropathic pain, inflammatory pain, or cancer pain. In the present invention, the inflammation includes sepsis, neuroinflammation, inflammatory bowel disease, chronic peptic ulcer or arthritis. In the present invention, the cardiovascular disease includes hypertension, cardiomyopathy, stroke, or atherosclerosis. In the present invention, the neurodegenerative disease includes parkinsonism, alzheimer's disease, huntington's disease or amyotrophic lateral sclerosis. In the present invention, the metabolic disease includes diabetes or gout.

In the invention, the effective dose of the sEH inhibitor is determined according to different diseases and symptoms of patients, and is 10-500 mg.

In the present invention, the frequency of administration of the formulation of the sEH inhibitor is preferably determined according to a treatment regimen, and particularly preferably includes once a week, once every 5 days, once every 3 days, once every 2 days, once a day, twice a day, three times a day, four times a day, five times a day, once an hour, or any higher frequency.

In the present invention, the sEH inhibitor administration preferably includes oral administration, injection or infusion; the site of administration preferably depends on the condition and disorder of the patient, and specifically preferably includes parenteral (including subcutaneous, intramuscular, intravenous, intraarticular, and intramedullary), intraperitoneal, transmucosal, transdermal, rectal, and topical (including dermal, sublingual, and intraocular).

In the present invention, the formulation of the sEH inhibitor preferably includes tablets, capsules, oral tincture ointments, oral pills, oral granules, oral powders, external tinctures, external ointments, external patches, external powders, external paints, suppositories, or injections; the tablet preferably comprises an enteric-coated tablet, a film-coated tablet, a sugar-coated tablet, an extract tablet, a dispersible tablet, a scratch tablet, a sustained-release coated tablet or a controlled-release tablet; the capsule preferably comprises a hard capsule, a soft capsule (capsule), an enteric capsule, a sustained-release capsule or a controlled-release capsule; the oral tincture ointment preferably comprises an oral solution, an oral suspension, an oral emulsion, a mucilage, an oral liquid, an emulsion, a colloidal solution, a mixture, a tincture, drops or suspension drops; the oral pill preferably comprises a big pill, a dropping pill or a honeyed pill; the oral granules, oral powder and oral powder independently comprise granules, enteric granules, dry suspension, inhalant powder, dry powder inhalant, dry powder inhalant, powder, medicinal powder or powder; said powder preferably comprises, said powder comprises, said topical tincture, topical ointment, topical patch and topical powder independently preferably comprises ointment, cream, cataplasm, salve, plaster, hydrophilic plaster, emulsion, gel, patch, emplastrum, pellicle, transdermal patch, eye drop, ear drop, nose drop, nasal drop, powder, dusting powder or dusting powder; said topical paints and suppositories independently preferably comprise suppositories, anal suppositories, vaginal suppositories, paints, plastics or coatings; the injection preferably comprises injection, solution for injection, injection for intravenous drip, suspension for injection, sterile powder for injection, intravenous injection, water injection, emulsion for injection, powder injection, sterile powder injection or freeze-dried powder injection.

The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

(1) Preparation of ethyl (S) -1- (3-fluoro-4-nitrobenzoyl) piperidine-3-carboxylate (Compound 2)

Adding 0.14mol of 3-fluoro-4-nitrobenzoic acid, 150mL of dried tetrahydrofuran and 0.014mol of DMF into a 500mL single-neck bottle to obtain a mixed solvent; dissolving 0.16mol of thionyl chloride in 50mL of dry tetrahydrofuran to obtain a thionyl chloride solution; dropwise adding the thionyl chloride solution into the mixed solution under the stirring condition, heating to 60 ℃ after dropwise adding, carrying out chlorination reaction for 3h, carrying out reduced pressure distillation to remove tetrahydrofuran and residual thionyl chloride till constant weight, and dissolving the obtained 3-fluoro-4-nitrobenzoyl chloride in 100mL of dry tetrahydrofuran to obtain a 3-fluoro-4-nitrobenzoyl chloride solution.

Adding 0.14mol of (S) -piperidine-3-ethyl formate, 0.41mol of triethylamine and 150mL of dry tetrahydrofuran into a 500mL three-necked bottle under the condition of stirring, cooling to 0 ℃ in an ice bath, dropwise adding a 3-fluoro-4-nitrobenzoyl chloride solution, carrying out acylation reaction for 10min after the dropwise adding is finished, carrying out suction filtration to obtain a filtrate and a filter cake, washing the filter cake to be colorless with 50mL of tetrahydrofuran, combining the obtained filtrate and the suction filtration solution, carrying out reduced pressure concentration to remove tetrahydrofuran, adding 200mL of water into the obtained concentrate, stirring, extracting for 2 times with ethyl acetate, washing with 250mL of ethyl acetate for single extraction, combining organic phases, washing with 270mL of hydrochloric acid solution with the concentration of 1mol/L, washing with 200mL of water and 200mL of saturated common salt, concentrating the obtained organic phases under a constant pressure to obtain a compound 2 (brownish red oily substance, 50.2 g). Structural characterization data for compound 2:¹HNMR(400MHz,CDCl₃):δ8.11(t,J＝8.08Hz,1H),7.33-7.31(m,2H),4.52(s,0.5H),4.16(s,2.5H),3.57-3.13(m,3H),2.60-2.46(m,1H),2.10(s,1H),1.81(dd,J＝9.32Hz,4.36Hz,2H),1.60(s,1H),1.26(s,3H).ESI-MS:m/z 325.1[M+H]⁺,347.0[M+Na]⁺。

(2) preparation of (S) -1- (4-amino-3-fluorobenzoyl) piperidine-3-carboxylic acid ethyl ester (Compound 3)

Adding 0.14mol of compound 2, 0.45mol of iron powder, 0.68mol of ammonium chloride, 200mL of ethanol and 200mL of water into a 1L single-mouth bottle, carrying out reflux reduction reaction for 20min at 80 ℃, cooling a reaction solution to room temperature, carrying out suction filtration on kieselguhr to obtain a filtrate and a filter cake, leaching the filter cake with 50mL of ethanol, combining the obtained filtrate and the suction filtration solution, carrying out reduced pressure concentration to remove ethanol, extracting the obtained concentrate with ethyl acetate for 2 times, wherein the volume of the ethyl acetate for single extraction is 200mL, washing with 200mL of water, washing with 200mL of saturated salt, drying with anhydrous magnesium sulfate, carrying out suction filtration to remove anhydrous magnesium sulfate, and reducing the filtrate to obtain the productConcentrating under pressure to constant weight to obtain crude product (37.4g), and purifying the crude product by silica gel column chromatography, wherein in the purification process of silica gel column chromatography, the mass ratio of the crude product to the silica gel for loading is 1:1.5, and the mass ratio of the crude product to the silica gel loaded in the silica gel column is 1: 5; the eluent used for the silica gel column chromatography purification is preferably EA and PE with a volume ratio of 1:5, yielding compound 3(26.05g, 65.6% total yield of step (1) and step (2)). Structural characterization data for compound 3:¹H NMR(400MHz,CDCl₃):δ7.10(dd,J＝11.28Hz,1.76Hz,1H),δ7.03(dd,J＝8.08Hz,1.4Hz,1H),6.76(t,J＝8.48Hz,1H),4.28(s,0.5H),4.13(q,J＝7.08Hz,2H),4.02(s,0.5H),3.51(s,2H),3.19(t,J＝10.8Hz,1H),3.04(td,J＝12.44Hz,1.96Hz,1H),2.54-2.49(m,1H),2.14-2.08(m,1H),1.80-1.68(m,2H),1.57-1.51(m,1H),1.24(t,J＝7.08Hz,4H)ESI-MS:m/z295.1[M+H]⁺,317.1[M+Na]⁺。

(3) preparation of ethyl (S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-carboxylate (Compound 4)

Adding 0.076mol of compound 3 and 600mL of dry dichloromethane into a 1L three-necked flask, cooling to below 0 ℃ under the condition of an ice salt bath, adding 100mL of dichloromethane solution of solid phosgene (the solid phosgene amount is 0.038mol), dropwise adding 100mL of dichloromethane solution of triethylamine (the triethylamine amount is 0.46mol), carrying out nucleophilic substitution-elimination reaction while dropwise adding, wherein the nucleophilic substitution-elimination reaction time is 3h, dropwise adding a mixed solution of 0.076mol of memantine, 0.152mol of triethylamine and 100mL of dichloromethane into the obtained isocyanate intermediate reaction liquid after the reaction is finished, completely reacting to form urea after dropwise adding, evaporating the reaction liquid to dryness to obtain compound 4 (crude product 39.9g), and directly carrying out the next reaction on compound 4 without purification. Structural characterization data for compound 4:¹H NMR(400MHz,CDCl₃):δ8.13(s,1H),7.26(s,1H),7.04(s,2H),6.95(s,1H),4.13(s,3H),3.20(s,1H),3.05(s,1H),2.52(s,1H),2.14(s,2H),1.83-1.64(m,9H),1.54-1.36(m,10H),0.85(s,6H).ESI-MS:m/z 500.4[M+H]⁺,522.4[M+Na]⁺。

(4) preparation of (S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-carboxylic acid (Compound II)

Adding 0.079mol of compound 4 (calculated according to the purity of 100 percent), 0.55mol of lithium hydroxide monohydrate, 250mL of tetrahydrofuran and 150mL of water into a 1L single-neck flask, carrying out a reaction for 1h at 50 ℃, carrying out reduced pressure concentration to remove tetrahydrofuran, adding 500mL of water into the obtained concentrate, stirring, cooling to below 0 ℃ under the condition of an ice salt bath, adjusting the pH value to 3 by using a hydrochloric acid solution with the concentration of 6mol/L, carrying out acidification, carrying out suction filtration on the separated white solid, rinsing the obtained filter cake by using 100mL of water, and drying to obtain a crude compound II (35.5g), wherein the crude compound II is directly subjected to the next reaction without purification. Structural characterization data for compound ii:¹H NMR(400MHz,CDCl₃):δ8.11(t,J＝7.76Hz,1H),7.73-7.64(m,1H),7.01(t,J＝6.76Hz,2H),4.69(s,0.5H),3.93-3.70(m,1.5H),3.40(s,1H),3.26(s,1H),2.50(s,1H),2.12(s,1H),2.03(s,1H),1.83(s,3H),1.67-1.59(m,4H),1.38-1.26(m,5H),1.18-1.10(m,2H),0.83(s,7H).ESI-MS:m/z472.3[M+H]⁺,494.3[M+Na]⁺。

(5) preparation of (S) -1- (4- {3- [ (1R,3R,5S,7S) -3, 5-dimethyladamantan-1-yl ] ureido } -3-fluorobenzoyl) piperidine-3-carboxamide (sEH inhibitor having the structure shown in formula I)

Adding 0.075mol of the compound II, 250mL of dry tetrahydrofuran and 7.5mmol of DMF (dimethyl formamide) into a 1L single-neck flask, dropwise adding 30mL of a tetrahydrofuran solution of thionyl chloride (the amount of the thionyl chloride is 0.094mol) at room temperature, after the dropwise adding is finished, carrying out chlorination reaction at room temperature for 3 hours, after the reaction is finished, carrying out reduced pressure distillation to remove the tetrahydrofuran and residual thionyl chloride to obtain an acyl chloride intermediate, and adding 200mL of dry tetrahydrofuran into the obtained acyl chloride intermediate to dissolve the acyl chloride intermediate to obtain an acyl chloride intermediate solution.

Adding 100mL of ammonia water with the concentration of 25-28 wt% and 200g of crushed ice into a 500mL three-necked bottle, cooling to 0 ℃ under the ice bath condition, dropwise adding the acyl chloride intermediate solution while carrying out an acylation reaction for 2h, layering after the reaction is finished, concentrating the obtained organic phase under constant pressure to constant weight, adding 500mL of water into the obtained concentrate, stirring, carrying out suction filtration, drying the obtained solid product to obtain a crude product, and purifying the obtained crude product by silica gel column chromatography to obtain the compound represented by the formulasET inhibitor (20g, with the purity of 98%, the total yield of the steps (1) - (5) is 31%, and the sEH inhibitor is recorded as GL-B437) with the structure shown as I; wherein, in the process of silica gel column chromatography purification, the mass ratio of the crude product to the silica gel for loading is 1:1.5, the mass ratio of the crude product to the silica gel loaded in the silica gel column is 1:5, and the eluent is a mixed solvent of EA and PE with the volume ratio of 1:1. The sEH inhibitor GL-B437 with the structure shown in the formula I is a white solid, and the melting point is 165-166 ℃;¹H NMR(400MHz,CDCl₃):δ8.18(t,J＝7.64Hz,1H),7.06(d,J＝7.40Hz,2H),5.62(s,1H),3.93-3.71(m,2H),3.57-3.23(m,2H),2.50(s,1H),2.15(s,1H),1.94(s,1H),1.83(s,2H),1.65(s,5H),1.50(s,1H),1.40-1.26(m,5H),1.20-1.12(m,2H),0.85(s,7H).ESI-MS:m/z 471.3[M+H]⁺,493.3[M+Na]⁺HRMS(ESI)calcd for C₂₆H₃₅FN₄O₃Na[M+Na]⁺493.2585, found:493.2611 the purity of compound GL-B437 was determined by Shimadzu 2010AHPLC at 98% (area normalization). The chromatographic column was WndaSil C18 Superb (5 μm, 4.6X 150mm), the mobile phase was acetonitrile/water 50%/50%, the flow rate was 1mL/min, the column temperature was 30 ℃, the detection wavelengths were 210nm and 230nm, and the retention time was 7.99 min.

Test example 1

Evaluation of hepatic microparticle stability of GL-B437

Human and SD rat liver microsomes were purchased from the reid liver disease institute (shanghai, china) limited.

The incubation system consisted of liver microsome in Tris-HCl buffer (100mM, pH 7.4), GL-B437 in DMSO (74. mu.g/mL), and NADPH (1.0mM) in a total volume of 500. mu.L.

The concentration of human liver microsomes was 0.5mg/mL, and the concentration of SD rat liver microsomes was 0.53 mg/mL.

Adding 10 mu L of GL-B437 DMSO solution, 440 mu L of liver microsome Tris-HCl buffer solution and 50 mu L of NADPH solution with the concentration of 1.0mM into a 5mLEP tube, incubating the obtained mixed solution at 37 ℃ for 0, 10, 30, 60, 120 and 180min, adding 500 mu L of glacial acetonitrile to terminate the reaction, taking 200 mu L of the mixed solution after vortexing for 1min, adding 400 mu L of ethyl acetate, vortexing for 1min, centrifuging for 5min at 3000rpm, taking 400 mu L of supernatant, and drying; redissolved with 150 μ L of solvent (acetonitrile: water volume ratio ═ 7:3), vortexed for 30s, centrifuged at 3000rpm for 5min, and 100 μ L of supernatant was aspirated and analyzed using shimadzu lc-2010A liquid phase. Liquid phase analysis conditions: the chromatographic column was WndaSil C18 Superb (5 μm, 4.6X 150mm), the mobile phase was acetonitrile/water volume ratio 50%/50%, the flow rate was 1mL/min, the column temperature was 30 ℃, the detection wavelengths were 210nm and 230nm, and the retention time was 7.99 min. L-B437 has a half-life of 174min in human liver microsomes and 120min in rat liver microsomes.

Test example 2

Assay for inhibitory Activity of sEH enzyme

(1) Laboratory apparatus and reagent

TABLE 1 Experimental instruments and reagents

The recombinant humanized soluble epoxide hydrolase was given by Bruce D.Hammock college of Daviscus university, California, and stored in a refrigerator at-80 ℃ at a concentration of 5 mg/mL.

Synthesis of AR-9281:

synthesis of tert-butyl 4- (hydroxyimino) piperidine-1-carboxylate (G2): adding 50.18mmol of hydroxylamine hydrochloride, 100.36mmol of potassium carbonate powder and 80mL of ethanol into a 250mL single-neck bottle, stirring for 1h at room temperature, then dropwise adding 50mL of G1(25.09mmol) ethanol solution, heating and refluxing for 2.5h after dropwise adding, decompressing and concentrating to remove ethanol, adding 65mL of water, stirring for 5min, performing suction filtration, washing the obtained filter cake with cold water, and drying to constant weight to obtain G2 (white solid, 5.03G, yield 93.67%, melting point 95-96 ℃).

Synthesis of tert-butyl 4-aminopiperidine-1-carboxylate (G3): adding 9.34mmol G2 and 80mL n-propanol into a 250mL single-neck bottle for dissolving, refluxing at 98 ℃, adding 140.1mmol metallic sodium in three batches, detecting complete reaction after 2.5h by TLC, adding 20mL water into reaction liquid for quenching reaction, concentrating under reduced pressure to remove most of solvent, adding 50mL water, extracting 3 times by dichloromethane, wherein the volume of dichloromethane for single extraction is 50mL, combining organic layers, washing 1 time by 50mL water, washing 1 time by 50mL saturated salt water, drying by anhydrous magnesium sulfate, filtering, concentrating the filtrate under reduced pressure to constant weight to obtain G3 (yellow oily liquid, 1.4G, yield 74.9%).

Synthesis of tert-butyl 4- [ (phenoxycarbonyl) amino ] piperidine-1-carboxylate (G4): adding 10.0mmol of G3, 50.0 mmol of potassium carbonate powder, 1mmol of DMAP and 30mL of dichloromethane into a 100mL three-necked bottle for dissolving, dropwise adding 6mL of dichloromethane solution of phenoxyformyl chloride (15mmol) at 0 ℃, transferring to room temperature after dropwise adding for reaction for 2.5h, adding 50mL of water into the reaction solution, extracting with dichloromethane for 2 times, wherein the volume of dichloromethane for single extraction is 50mL, combining organic layers, washing with 40mL of water for 1 time, washing with 40mL of saturated sodium carbonate solution for 1 time, washing with 50mL of saturated common salt for 1 time, drying with anhydrous magnesium sulfate, performing suction filtration, and concentrating the filtrate under reduced pressure to constant weight to obtain G4 (yellow white solid, 3.27G, and the yield of 102.2%).

Synthesis of tert-butyl 4- {3- [ (3s,5s,7s) -adamantan-1-yl ] ureido } piperidine-1-carboxylic acid tert-butyl ester (G5): a25 mL single neck flask was charged with 1.9mmol of G4, 2.09mmol of amantadine, 5.7mmol of potassium carbonate powder, 0.19mmol of DMAP and 15mL of dry THF to dissolve, refluxed at 75 ℃ for 3.5h, concentrated under reduced pressure to remove THF, stirred with 20mL of water for 20min, filtered, the cake washed 2 times with 10mL of saturated citric acid solution, and dried to give G5 (white solid, 0.69G, 97.18% yield).

Synthesis of 1- [ (3s,5s,7s) -adamantan-1-yl ] -3- (piperidin-4-yl) urea (G6): to a 25mL single neck flask were added 1.83mmol G5, 36.58mmol TFA and 10mL dichloromethane and stirred to react at room temperature for 4h, followed by addition of 20mL water and dichloromethane for 2 extractions, 20mL dichloromethane volume for single extraction was 20mL, organic layers were combined, 20mL water was washed 1 time, 20mL saturated brine was washed 1 time, dried over anhydrous sodium sulfate, filtered and the filtrate was concentrated under reduced pressure to constant weight to give G6 (white solid, 0.39G, yield 76.9%).

1- (1-acetylpiperidin-4-yl) -3- [ (3s,5s,7s) -adamantan-1-yl]Synthesis of Urea (AR-9281): adding 1.98mmol of G6, 5.94mmol of potassium carbonate powder and 13mL of dichloromethane into a 25mL single-neck bottle, dropwise adding a dichloromethane solution of 2mL of acetyl chloride (2.18mmol) at 0 ℃, reacting at room temperature for 10 hours after dropwise adding, adding 20mL of water, extracting with dichloromethane for 2 times, wherein the volume of dichloromethane for single extraction is 20mL, combining organic layers, washing with 20mL of water for 1 time, washing with 20mL of saturated sodium bicarbonate solution for 1 time, washing with 20mL of saturated salt for 1 time, drying with anhydrous sodium sulfate, carrying out suction filtration, and concentrating the filtrate under reduced pressure to constant weight to obtain 0.31G of a crude product; the crude product was subjected to silica gel column chromatography, 3g of silica gel packed column, 0.5g of silica gel packed, and EA: PE ═ 1:10 eluted to give 0.23g of eluted white solid, which was recrystallized from 15mL of acetonitrile to give AR-9281 (white crystals, 0.18g, yield 28.5%). Structural characterization data for AR-9281:¹H NMR(400MHz,DMSO-d₆)δ:5.66(d,J＝7.6Hz,1H),5.41(s,1H),4.09-4.06(m,1H),3.67-3.64(m,1H),3.52-3.31(m,1H),3.10-3.06(m,1H),2.78-2.71(m,1H),1.97(s,6H),1.85-1.84(m,6H),1.78-1.71(m,2H),1.56(s,6H),1.08-1.04(m,1H),1.20-1.16(m,1H).ESI-MS:m/z 342.5[M+Na]⁺.

synthesis of PHOME:

(E) -synthesis of 4-phenylbut-3-enoic acid (P2): adding 8.3mmol of phenylacetaldehyde, 8.3mmol of malonic acid, 1.6mmol of piperidine and 15mL of pyridine into a 25mL single-neck bottle, stirring and reacting for 12h under the condition of 100 ℃ under the protection of argon, concentrating under reduced pressure to remove the solvent, adding 20mL of water, adding sodium hydroxide solid under stirring to adjust the pH value to 13, washing an aqueous layer with ethyl acetate for 3 times, washing with ethyl acetate for one time for 20mL in volume, adjusting the pH value of the aqueous layer with 1M hydrochloric acid to 2, extracting with ethyl acetate for 3 times, extracting with ethyl acetate for 20mL in volume for one time, combining organic layers, washing with 20mL of water for 1 time, washing with 20mL of saturated salt for 1 time, drying with anhydrous magnesium sulfate, carrying out suction filtration, and concentrating the filtrate under reduced pressure to constant weight to obtain P2(0.7g of light yellow liquid with the yield of 52.0%).

Synthesis of 2-hydroxy-2- (6-methoxynaphthalen-2-yl) acetonitrile (P4): adding 53.74mmol of trimethylsilyl cyanide, 26.87mmol of zinc chloride and 30mL of dichloromethane into a 100mL three-necked bottle, dropwise adding 10mL of dichloromethane solution of 6-methoxy-2-naphthaldehyde (26.87mmol) at 0 ℃, reacting for 4 hours at room temperature after dropwise adding, installing a 30 wt% NaOH tail gas absorption device, adding 20mL of ethyl acetate into reaction liquid, slowly dropwise adding 30mL of 10 wt% hydrochloric acid solution into the reaction liquid at 0 ℃, stirring overnight at room temperature after dropwise adding, separating an organic layer, extracting an aqueous layer for 2 times by using ethyl acetate, wherein the volume of ethyl acetate for single extraction is 40mL, combining organic layers, washing 40mL of water for 1 time, washing 40mL of saturated salt for 1 time, drying anhydrous magnesium sulfate, carrying out suction filtration, and concentrating the filtrate under reduced pressure to constant weight to obtain 3.67g of a crude product. The crude product was purified by silica gel column chromatography, 37g silica gel packed column, 7.4g silica gel packed, and EA was eluted with gradient PE: AcOH 1:100: 0.1% → EA: PE: AcOH 1:10: 0.01% to give P4(3.50g, white solid, yield 61.4%).

Synthesis of cyano (6-methoxynaphthalen-2-yl) methyl- (E) -4-phenylbut-3-enoic acid ester (P5): 27.70mmol of P2, 23.09mmol of P4, 2.31mmol of DMAP and 30mL of dichloromethane are added into a 25mL single-neck bottle, 20mL of EDCI (34.63mmol) dichloromethane suspension is dropwise added at 0 ℃, reaction is carried out at room temperature for 8h after the dropwise addition is finished, reaction is completed, 40mL of water is added, dichloromethane is extracted for 2 times, the volume of dichloromethane for single extraction is 40mL, organic layers are combined, 40mL of water is washed for 1 time, 40mL of 1 wt% dilute sulfuric acid aqueous solution is washed for 1 time, 40mL of saturated common salt water is washed for 1 time, anhydrous magnesium sulfate is dried and filtered, and the filtrate is concentrated under reduced pressure to constant weight to obtain 8.48g of black oily liquid. Chromatography on silica gel, 80g of silica gel, 11g of silica gel, and a eluent EA PE (PE 1: 200) to give 3.0g of a yellow liquid, followed by recrystallization from 20mL of ethanol to give P5(2.5g of a white solid having a melting point of 118-120 ℃). Structural characterization data for P5:¹HNMR(400MHz,CDCl₃)δ:7.95(d,J＝1.2Hz,1H),7.82(d,J＝15.2Hz,1H),7.80(d,J＝15.6Hz,1H),7.54(dd,J＝8.5Hz,1.9Hz,1H),7.36-7.28(m,4H),7.25-7.20(m,2H),7.16(d,J＝2.4Hz,1H),6.60(s,1H),6.53(d,J＝15.9Hz,1H),6.29(dt,J＝15.9Hz,7.0Hz,1H),3.94(s,3H),3.38-3.34(m,2H).

synthesis of cyano (6-methoxynaphthalen-2-yl) methyl-2- (3-phenyloxiran-2-yl) acetate (PHOME): adding 8.4mmol m-CPBA and 5mL dichloromethane into a 50mL three-necked flask, adding 2.8mmol P5 into the three-necked flask at 0 ℃, reacting for 10h at room temperature, filtering to remove solid in the reaction solution, adding 2.8mmol m-CBPA at 0 ℃, reacting for 10h at room temperature, filtering to remove solid in the reaction solution, freezing the reaction solution in a refrigerator for 4h, filtering again to remove solid in the reaction solution, adding 30mL petroleum ether into 10mL reaction solution, standing for 1 day at room temperature to separate filtrate, adding 10mL petroleum ether into the filtrate, standing for 5h at room temperature, adding 10mL petroleum ether into the filtrate, standing for 1 day at room temperature, filtering, leaching the solid with 4mL diethyl ether, and drying to constant weight to obtain PHOME (white solid, 10 mg). Structural characterization data for PHOME:¹HNMR(400MHz,CDCl₃)δ:7.94(d,J＝1.2Hz,1H),7.81(d,J＝12.5Hz,1H),7.79(d,J＝12.9Hz,1H),7.33-7.30(m,3H),7.25-7.21(m,3H),7.16(d,J＝2.4Hz,1H),6.62(s,1H),3.94(s,3H),3.71(d,J＝1.9Hz,1H),3.37-3.34(m,1H),2.91-2.76(m,2H).ESI-MS:m/z 396.0[M+Na]⁺,769.1[2M+Na]⁺.

(2) principle of experiment

sEH can hydrolyze the epoxy ring in the PHOME substrate, releasing cyanohydrin upon intramolecular cyclization. Under the alkaline condition, cyanohydrin is rapidly decomposed into cyanide ions and 6-methoxy-2-naphthaldehyde, the latter has strong fluorescence signals at the excitation wavelength of 330nm and the emission wavelength of 465nm, and the strength of the signals is inversely proportional to the strength of the inhibition effect of sEH. Based on the above principle, the inhibition rates of samples with different concentrations were calculated compared to the control group. IC Using IBM SPSS statistics 20 software Compounds based on inhibition Rate and concentration₅₀。

(3) Arrangement of reagents and drugs

25mM Tris-HCl buffer (pH 7.4, 1% BSA): 12.5mL of 1M Tris-HCl buffer was taken, 5mg of BAS was added, diluted with Waohaha purified water and adjusted to pH 7.4 with concentrated hydrochloric acid, and finally the volume was adjusted to 500 mL.

PHOME substrate solution: dissolving PHOME in DMSO to obtain 20mM PHOME solution, and storing at-80 deg.C in refrigerator; when the reagent is used, the reagent is diluted to 1/3mM by using Tris-HCl buffer solution.

sEH solution: mu.L of sEH at a concentration of 5mg/mL was added to 499. mu. LTris-HCl buffer to prepare a 10. mu.g/mL stock solution, which was stored in a freezer at-80 ℃. When in use, the solution is diluted to a use concentration of 4 mu g/mL by using Tris-HCl buffer solution.

Dissolving GL-B437 compound in DMSO to obtain 20mM solution, and storing in refrigerator at-20 deg.C; high concentration compounds at 20mM were diluted with DMSO gradient for a total of five concentrations: 100nM, 50nM, 25nM, 12.5nM, 6.25 nM.

(4) sEH inhibition experiments

Grouping experiments: solvent group, 100% viability group (a), inhibitor group (B) and positive control group (C), as shown in table 2:

TABLE 2 test of the inhibitory Activity of the sEH enzyme component cases

(5) The experimental steps are as follows:

(5.1) adding 148 mu L/hole Tris-HCl buffer solution into a 96 black-bottom micro-porous plate, and arranging three compound holes for each compound;

(5.2) sequentially adding 2 mu L of samples to be tested, replacing a solvent group and a 100% activity group with equal volume of DMSO, and adding AR-9281 into a positive control group; the final concentrations of the test compounds were: 1nM, 0.5nM, 0.25nM, 0.125nM, 0.0625 nM;

(5.3) adding 20. mu.L of sEH solution (final concentration 400ng/mL), and replacing the solvent group with an equal volume of Tris-HCl buffer;

(5.4) adding 30. mu.L of PHOME substrate to start the reaction (final concentration 50. mu.M), and incubating in a thermostat at 37 ℃ for 10 min;

and (5.5) detecting fluorescence signal data by using a microplate reader, wherein the excitation wavelength is 330nm, and the emission wavelength is 465 nm.

(6) Data analysis

Setting three multiple wells for each sample, wherein the average value of the three multiple wells is the fluorescence value (F) of the compound to be detected, and the inhibition rate [ (AF-BF)/AF ] is%]100% of fluorescence values for AF and BF inhibitors, respectively. IC of the compounds was calculated from inhibition and concentration using IBM SPSS statistics 20 software₅₀。

Remarking: mu M is mu mol/L.

And (3) testing results: half inhibition concentration IC of GL-B437 on recombinant human sEH₅₀It was 0.06 nM.

Test example 3

Pharmacokinetic evaluation of GL-B437

(1) Laboratory animal

8-week-old female SD rats, SPF grade, purchased from the Experimental animals center of the university of traditional Chinese medicine in Anhui, with an animal license number of: SCXK (Anhui) 2017-. The rats are bred conventionally after purchase, the room temperature is 22-24 ℃, the illumination is carried out for 12 hours each day and night, and the rats are suitable for breeding for at least 3 days and then are used for experiments. All animal experimental procedures have been approved by the ethical committee of the university of medicine in anhui.

(2) Laboratory apparatus and reagent

Multi-tube vortex oscillator: DMT-2500, Hangzhou Mi Europe Instrument Co.

A centrifuge: G-16C, Sadorius (sartorius).

Balance: XP-6, Metler-Toriledo instruments (Shanghai).

Liquid phase: VanquishuPLC, Thermo Fisher.

Triple quadrupole LC MS: TSQAlts, Thermo Fisher.

(3) Test method

Intravenous vehicle: 8% absolute ethyl alcohol + 4% tween 80+ 88% normal saline (volume fraction).

The preparation method of the administration preparation comprises the following steps: weighing a sample in a container, transferring 8% absolute ethyl alcohol to fully dissolve the sample, adding 4% tween 80, stirring until the sample is clear and transparent, adding 88% normal saline, and fully stirring until the sample is clear and transparent.

Oral administration vehicle: 0.5% CMC-Na suspension. The preparation method of the administration preparation comprises the following steps: accurately weighing corresponding medicine, placing in EP tube, adding quantitative 0.5% CMC-Na water solution, ultrasonic crushing to obtain suspension, stabilizing, storing at 4 deg.C, and mixing by vortex.

The intravenous injection dosage of the SD rats in the GL-B437 group is 10 mg/kg; the administration dose of the gavage group is 50 mg/kg. GL-B437: 14 SD rats, randomly divided into gavage (po) and intravenous (iv) groups, were fasted for over 12h the day before the experiment without water deprivation. Respectively taking 0.2mL of blood from orbital venous plexus before administration and 5min, 10min, 15min, 30min, 1h, 2h, 4h, 6h, 8h, 12h and 24h after administration in the group po and the group iv, placing the blood into an EDTA-K2 anticoagulation centrifuge tube, centrifuging for 5min at the temperature of 4 ℃ and 11000rpm, separating plasma in 2h, and storing a sample to be detected at the temperature of 70 ℃.

And (3) sample analysis: taking 50 mu L of sample to be detected, adding 50 mu L of internal standard working solution (tadalafil 20.000ng/mL), adding 300 mu L of acetonitrile after vortex mixing, vortex mixing for 10min, centrifuging at 4 ℃ and 4200rpm for 10min, taking 150 mu L of supernatant, adding 150 mu L of pure water, vortex mixing, centrifuging at 4 ℃ and 4200rpm for 10min, taking supernatant for injection.

(4) Data analysis

Data processing was automatically calculated by AB Sciex Multi Quant2.1 software and the main pharmacokinetic parameters of GL-B437 in rats were analyzed statistically in a non-compartmental model using DAS3.0 pharmacokinetic software. The absolute bioavailability F is calculated as follows:

wherein D is_ivIndicates the intravenous dose, D_poRepresents an orally administered dose; AUC_ivArea under the curve, AUC, representing the time of administration by intravenous injection_poThe area under the curve is shown for the orally administered drug.

The non-clinical pharmacokinetics research result of GL-B437 shows that after 10mg/kg of GL-B437 is given to SD rats by intravenous injection, the blood concentration of GL-B437 reaches the peak value of 3342.73ng/L after 5 min; time of drug curve AUC_0-24h(area under the curve for drug time over 24 h) total exposure was 1832.11ng h/L; the half-life is 6.25 h. After the oral administration of 50mg/kg to SD rats, the peak reaching time is 38min, and the drug time curve AUC_0-24hThe total exposure is 2620.520 ng.h/L, and the half-life is 5.179 h; the absolute bioavailability of GL-B437 was 28.6%.

FIG. 1 is the curve of the drug time after tail vein injection and gastric lavage, and it can be seen from FIG. 1 that the concentration of compound GL-B437 reaches the peak value in the rat body after 5min of intravenous injection, and the blood drug concentration gradually decreases with time; after the compound GL-B437 is administrated by stomach filling for 38min, the concentration of the compound GL-B437 in a rat body reaches a peak value, and the blood concentration is gradually reduced along with the time.

Test example 4

Acute toxicity test of GL-B437

(1) Laboratory animal

Male ICR mice, 3. Animals are all raised in Shenyang pharmaceutical university New research building 612 room (mouse room), the environmental temperature is kept at 20-24 ℃, the humidity is kept at about 50%, and drinking water is freely taken.

(2) Reagent, medicine and preparation

Preparation of compound B437 suspension with maximum gavage concentration: compound GL-b4370.7498g was weighed, dissolved in 2.5ml of 0.5 wt% CMC-Na solution and sonicated to make a suspension.

(3) Laboratory apparatus

A 4 ℃ low-temperature refrigerator: a hair freezer, SC 390;

one-ten-thousandth balance: mettler-tolitho instruments (shanghai) ltd, GB 172311;

micro vortex mixer: shanghai Jingke industries, Ltd., H-1;

an induction cooker: a beauty group;

(4) experimental methods

Grouping and dosing regimens for experimental animals: mice were divided into 2 groups, 1 placebo group, 2 compound B437 group. The compound B437 group was administered with 6.0g/kg by intragastric administration, the administration volume was 20ml/kg, and the blank control group was administered with the same amount of distilled water by intragastric administration.

The experimental steps are as follows: 3 ICR mice, male, were randomly assigned to Compound B437 and blank groups. The maximum volume of the mixture (20ml/kg) and the maximum concentration of the mixture GL-B437 suspension (0.3g/ml) were administered at 6.0g/kg, and the same volume of distilled water (20ml/kg) was administered to the blank group. The day of administration, changes in autonomic activity, feeding, excretion, eye and nose were recorded for 14 days and the body weight of the mice was recorded daily.

(5) Results of the experiment

The results of acute toxicity experiments showed that mice were gavaged with 6.0g/kg of compound GL-B437 and observed for 14 consecutive days without death of the animals and macroscopic abnormal reactions. It is shown that GL-B437 did not show any toxicity or adverse reactions after oral administration at 6g/kg in mice.

FIG. 2 shows the results of comparison of the body weights of the mice in the control group and the administration group, and it can be seen from FIG. 2 that the body weight monitoring for 14 consecutive days showed that the compound GL-B437 had no effect on the body weight of the mice as compared with the control group.

Test example 5

Analgesia test of GL-B437 on neuropathic pain of SNI model rat

(1) Laboratory animal

The weight of SD rats is 180-220 g, the SPF grade is male, the SD rats are purchased from Jinanpunyue laboratory animal breeding company, and the animal license number is as follows: SYXK 20190003, is purchased and conventionally raised, the temperature difference between 18 and 22 ℃ and the daily temperature difference is less than or equal to 4 ℃, the relative humidity is 40 to 70 percent, the lighting is carried out for 12 hours each day and night, the animals freely eat and drink water, quarantine observation is carried out after the animals are raised for at least 3 days, the performance of activities, diet and the like of the animals is observed, and qualified animals are used for experiments. All animal experimental procedures have been approved by the ethics committee of the university of tobacco desk.

(2) Test compounds: GL-B437, positive controls were gabapentin and EC-5026.

Instruments and reagents:

TouchText SensoryEvaluator：DanMic Global。

SC-15 digital display constant temperature water bath: ningbo Xinzhi Biotech Co., Ltd.

KQ-500DE numerical control ultrasonic cleaner: kunshan ultrasonic instruments Inc.

AE224C electronic balance: shanghai Shunhui scientific instruments, Inc.

Centrifuge 5424R bench Centrifuge: the Eibend Life sciences Ltd.

ST16 type centrifuge: sammer Feishel technologies, Inc.

MS-H-Pro magnetic stirrer: darongxing laboratory instruments (Beijing) Inc.

VORTEX-5 VORTEX mixer: the Linbel instruments manufacture, Inc. of Haiman.

And (3) the other: 96-well plate, surgical scissors, hemostatic forceps, suture needle, medical suture (2-0), medical silk braided wire (4-0 for nerve ligation), 75% alcohol, desk lamp, retractor, cotton ball, and injector

(3) Preparation of sciatic nerve branch selection injury model

Before testing, all animals are fasted for 8-10 h, and the animals are marked with a marker pen by numbering at the tail of the animals. Before the experiment, all surgical instruments are subjected to disinfection treatment, autoclaving and drying, blood vessel ligatures are prepared, cut into small sections and soaked in normal saline or disinfected alcohol, and the room temperature is maintained at 18-22 ℃. Deeply anaesthetizing the rat by 10% chloral hydrate according to the weight of 30-40 mg/100g of the rat, preparing the skin of the lateral side of the hind limb on one side (the left side), cutting the skin along the femur, using forceps in the ophthalmology to open along the muscle texture to find the branch of the sciatic nerve, ligating and cutting the tibial nerve and the common peroneal nerve, and reserving the finest sural nerve. After nerve ligation, the surgical site was sutured with medical silk braided wire, and after suturing, iodine tincture was wiped on the surgical skin, and broad-spectrum antibiotic penicillin potassium was injected to the surgical site. The rats are placed in cages and kept awake naturally at room temperature. The sham group was sutured after exposure of the nerves only, and no other treatment was performed.

(4) Design and grouping of experiments

After the model building is successful, the rats are randomly grouped according to the weight and are divided into a control group, a model group, a gabapentin group, a GL-B437 group (four doses), an EC-5026 group and a pseudo-operation group, the pseudo-operation group is used as a negative control group to verify whether the model building is successful or not, statistics does not need to be participated in, and the experimental data amount n of each group is more than or equal to 6 in the experimental process. After the induced pain is generated (3-5 days after molding), the medicine is regularly taken once every day and is continuously taken.

(5) Dosage to be administered

The preparation of the medicine comprises the following steps: accurately weighing corresponding medicines, placing the medicines into a 15mL EP tube, adding a quantitative 0.5% sodium carboxymethylcellulose aqueous solution, carrying out ultrasonic crushing treatment to prepare a suspension, and standing the suspension at 4 ℃ for storage after the suspension is stable. The administration mode is oral, the administration dosage is 1mg/kg/d, 3mg/kg/d, 9mg/kg/d, 27mg/kg/d, the administration is once every 12h, and the administration is continuously carried out for 20 days. The doses and groups administered are shown in table 3:

TABLE 3 dosage and grouping

(6) Pharmacodynamic experiment

Spontaneous painful behavior after molding can occur: (1) scratching: lifting the rear left or right paw to rapidly move the paw and the paw to grab each part of the body; (2) biting: the skin on the left or right side of the body is pierced with the mouth and teeth.

And performing behavioral experimental test-mechanical pain sensitivity test 1h before and 2h after the molding. Mechanical hyperalgesia was measured on days 1, 2, 4, 8, 16, 20 after administration. A tactile sensation test was performed by a vertical method using a von Frey cilia mechanical stimulation needle, and PWT (10) was recorded for data^[Xf+kδ]) And/10000 treating.

Data were processed using statistical software GraphPad Prism 8.0.2 and results are presented as mean ± standard deviation. Firstly, a Leven's test method is adopted to carry out homogeneity test on the variance of each group of data, and statistical analysis is carried out by adopting One-way ANOVA (One-way ANOVA) if the homogeneity of the variance is more than 0.05. If ANOVA was statistically significant (P <0.05), further comparisons between groups were performed using LSD test (parametric). If the variances are not uniform (P <0.05), non-parametric tests are performed using Kruskal-Wallis. If the Kruskal-Wallis test is statistically significant (P.ltoreq.0.05), a further pairwise comparison between the means is carried out using the Mann-WhitneyU method.

Fig. 3 shows paw withdrawal threshold comparison results, where a is the paw withdrawal threshold comparison result between the control group and each administration group, and b is the paw withdrawal threshold comparison result between the control group and each administration group before administration. As can be seen from a in FIG. 3, the paw contraction threshold of the model group rats is significantly reduced and has significant difference compared with the control group and the sham operation group, which indicates that the SNI model is successfully prepared. As shown in b of FIG. 3, the sham group was compared with the control groupThe PWT decreased slightly but was not statistically significant in the operative group. Model group showed significant reduction in PWT compared to blank control group, with statistical significance for the difference: (^***P<0.001); the PWT was significantly reduced compared to the sham group, and the difference was statistically significant (^###P<0.001). The PWT values of the administration groups before administration were significantly lower than those of the control group in the paw contraction threshold before the first administration, and the differences in PWT among the administration groups had statistical significance: (^***P<0.001) and has significant difference, which shows that the preparation of the neuropathic pain model caused by the SNI of each administration group is successful and can be used for pharmacodynamic research of analgesia.

FIG. 4 shows the comparison of paw contraction thresholds between the model group and the administration groups, and it can be seen from FIG. 4 that the relief of SNI neuropathic pain in SD rats is marked by a significant increase in PWT, which is observed on day 1 in the group containing GL-B437 at 3mg/kg/d, 9mg/kg/d, and 27mg/kg/d, and the PWT is significantly increased compared to the model group (statistical differences^*P<0.05，^**P<0.01); on day 2 of continuous administration, PWT was significantly increased at 27mg/kg/d in GL-B437 and GP group compared with that in model group, and statistical differences were observed (^#P<0.05); on the 4 th day of continuous administration, the PWT of the GL-B437 administration group of 9mg/kg/d, 27mg/kg/d, gabapentin and EC-5026 was significantly increased compared with the model group, and statistical differences were observed (^$P<0.05，^$$P<0.01); on day 8 of continuous administration, PWT was significantly increased in the GL-B437 group at 27mg/kg/d and GP administration groups as compared with the model group, and there was a statistical difference: (^&P<0.05); on day 16 of continuous administration, PWT was significantly increased in the 9mg/kg/d B437 administration group as compared with the model group, with statistical differences (@ P)<0.05), better than gabapentin and EC-5026; on day 20 of continuous administration, PWT was significantly increased in the 3mg/kg/d and 9mg/kg/d GL-B437 administration groups compared with the model group, with statistical difference ((R))^▲P<0.05) is obviously superior to gabapentin and EC-5026.

Gabapentin is a ligand of α 2 δ subunit of voltage-dependent calcium channel, and can reduce calcium ion influx, thereby reducing excitatory transmitter release and spinal sensitization, and has good therapeutic effect on neuropathic pain. Because of the limited number of ligands in animals, continuous administration is easily saturated and easily causes tolerance, thereby causing the phenomenon of reduced efficacy. After 20 days of continuous administration, the analgesic effect of gabapentin is obviously reduced, and is obviously weaker than that of the GL-B437 group of 3mg/kg/d and 9mg/kg/d administration groups. Analgesic tests show that GL-B437 has a remarkable analgesic effect on neuropathic pain caused by SNI, a low-dose group shows obvious dose dependence, wherein the analgesic effect of doses of 3mg/kg/d and 9mg/kg/d is optimal, and the analgesic effect is better than that of gabapentin and EC-5026, and the analgesic effect of a 1mg/kg/d administration group is weaker.

FIG. 5 is the drug aging curve after the last administration, and it can be seen from FIG. 5 that on the 20 th day of continuous administration, rats administered with 3mg/kg/d and 9mg/kg/d GL-B437 showed significant analgesic effect 2h after administration, and could last for more than 6h, with the onset speed and analgesic effect superior to gabapentin and EC-5026.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.