反应详情

温度

60 °C

2 cm3 of 5N aqueous sodium hydroxide solution were added, with stirring and under an inert atmosphere, to a solution of 0.48 g of methyl (3R,4R)-4-[3-(R,S)-hydroxy-3-(6-methoxyquinolin-4-yl)propyl]-1-[2-(cyclopentylthio)ethyl]piperidine-3-carboxylate in 10 cm3 of methanol. After heating the mixture for 16 hours at a temperature in the region of 60° C., the reaction mass was evaporated under reduced pressure (2.9 kPa) at a temperature in the region of 60° C. and the residue obtained was taken up in 4.3 cm3 of distilled water to which had been added 4.3 cm3 of 28% hydrochloric acid. The remaining insoluble material was filtered off and then the filtrate was evaporated under the same conditions as above. The residue obtained was stirred in a dichloromethane/methanol (90/10 by volume) mixture. The resulting precipitate was filtered off and washed with 3 times 2.5 cm3 of the same mixture. The filtrate was evaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C. 0.48 g of (3R,4R)-4-[3-(R,S)-hydroxy-3-(6-methoxyquinolin-4-yl)propyl]-1-[2-(cyclopentylthio)ethyl]piperidine-3-carboxylic acid dihydrochloride was obtained in the form of a foam with a green color melting with softening at a temperature in the region of 156° C.

1. customthe reaction mass was evaporated under reduced pressure (2.9 kPa) at a temperature in the region of 60° C.
2. customthe residue obtained
3. filtrationThe remaining insoluble material was filtered off
4. customthe filtrate was evaporated under the same conditions as above
5. customThe residue obtained
6. filtrationThe resulting precipitate was filtered off
7. washwashed with 3 times 2.5 cm3 of the same mixture
8. customThe filtrate was evaporated under reduced pressure (5 kPa) at a temperature in the region of 40° C