反应详情

A 2 N aqueous lithium hydroxide solution (1.92 mL, 3.83 mmol) was added to a solution of ethyl cis(±)-2-(4-{[(4-chloro-5-ethyl-1H-imidazol-2-yl)carbonyl]amino}-3-ethoxypiperidin-1-yl)-4-[(2-fluoroethyl)carbamoyl]-1,3-thiazole-5-carboxylate obtained in Example (250a) (209 mg, 0.38 mmol) in methanol (4 mL) at room temperature, followed by stirring for 4.5 hours. The reaction solution was concentrated under reduced pressure, and then a 1 N aqueous hydrochloric acid solution was added to the resulting residue. The aqueous layer was extracted with ethyl acetate. The combined organic layers were dried over anhydrous magnesium sulfate and filtered, and then the filtrate was concentrated under reduced pressure. The resulting solid was suspended and washed in diethyl ether to obtain 82 mg of the title compound as a milk white solid (41%).

1. concentrationThe reaction solution was concentrated under reduced pressure
2. additiona 1 N aqueous hydrochloric acid solution was added to the resulting residue
3. extractionThe aqueous layer was extracted with ethyl acetate
4. dry with materialThe combined organic layers were dried over anhydrous magnesium sulfate
5. filtrationfiltered
6. concentrationthe filtrate was concentrated under reduced pressure
7. washwashed in diethyl ether