Nipecotic acid derivative and use thereof for medical purposes
A technology of piperidinecarboxylic acid and its derivatives, which can be applied in the direction of drug combination, pharmaceutical formula, and active ingredients of heterocyclic compounds, etc. It can solve the problems that there is no 3-piperidinecarboxylic acid diamide structure, and the relationship of inhibitory activity is not disclosed or implied. , to achieve excellent therapeutic effect and reduce side effects
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Embodiment 1)
[0177] (Example 1) (R)-N-(4-cyano-2-(trifluoromethoxy)benzyl)-1-(1-propionamidecyclobutanecarbonyl)piperidine-3-carboxamide synthesis:
[0178] 〔step 1〕
[0179] Synthesis of 4-bromo-2-(trifluoromethoxy)benzaldehyde:
[0180] At -78°C, a solution of n-butyllithium hexane was added dropwise over 1.5 hours to a solution of 4-bromo-1-iodo-2-(trifluoromethoxy)benzene (25 g, 68 mmol) in THF (0.40 L) (1.6N, 86mL, 0.14mol). After stirring at -78° C. for 1 hour, DMF (11 mL, 0.14 mmol) was added dropwise to the reaction solution over 10 minutes. After stirring at -78°C for 2 hours, an aqueous citric acid solution (0.25M, 0.25L, 63mmol) was added to the reaction solution, followed by extraction with ether. The organic layer was dried over anhydrous sodium sulfate and then concentrated under reduced pressure to obtain 16 g (87%) of 4-bromo-2-(trifluoromethoxy)benzaldehyde (hereinafter referred to as Reference Example Compound 1).
[0181] [Step 2]
[0182] Synthesis of (4-bromo-2-(...
Embodiment 2)
[0211] (Example 2) (R)-N-(4-cyano-2-(trifluoromethoxy)benzyl)-1-(2-methyl-2-(methylsulfonamide)propionyl)piper Synthesis of pyridine-3-carboxamide:
[0212] 〔step 1〕
[0213] (R)-tert-butyl(1-(3-((4-cyano-2-(trifluoromethoxy)benzyl)carbamoyl)piperidin-1-yl)-2-methyl-1 -Oxopropan-2-yl) carbamate synthesis:
[0214] Under ice-cooling, in reference example compound 8 (3.5g, 11mmol), 2-((tert-butoxycarbonyl)amino)-2-methylpropionic acid (2.6g, 13mmol), DIPEA (4.1mL, 24mmol) HATU (4.9 g, 13 mmol) was added to DMF (40 mL) solution. After stirring at room temperature for 1 hour, water and 1N hydrochloric acid were added to the reaction solution, followed by extraction with ether. The organic layer was washed with saturated aqueous sodium bicarbonate solution, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained crude product was purified by silica gel column chromatography (Amine silica gel DM1020 manufactured by Fuji Shirishia Chemical Co.,...
Embodiment 3)
[0221] (Example 3) (R)-N-(4-cyano-2-(trifluoromethoxy)benzyl)-1-(1-(methylsulfonamide)cyclopropanecarbonyl)piperidine-3- Synthesis of formamide:
[0222] 〔step 1〕
[0223] (R)-tert-Butyl(1-(3-((4-cyano-2-(trifluoromethoxy)benzyl)carbamoyl)piperidine-1-carbonyl)cyclopropyl)carbamate Synthesis of esters:
[0224] Under ice-cooling, DMF of reference compound 8 (0.67g, 2.0mmol), 1-((tert-butoxycarbonyl)amino)cyclopropanecarboxylic acid (0.49g, 2.4mmol), DIPEA (1.1mL, 6.1mmol) (5.0 mL) solution was added HATU (1.1 g, 2.5 mmol). After stirring at room temperature for 1 hour, water and 1N hydrochloric acid were added to the reaction solution, followed by extraction with ether. The organic layer was washed with saturated aqueous sodium bicarbonate solution, dried over anhydrous sodium sulfate, and concentrated under reduced pressure. The obtained crude product was purified by silica gel column chromatography (Amine silica gel DM1020 manufactured by Fuji Shirishia Chemical Co., Lt...
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