反应详情

温度

25 °C

A solution of rac-(3-chloro-4-methanesulfonyl-phenyl)-(cyclohex-2-enyloxy)-acetic acid methyl ester (350 mg, 0.98 mmol) in ethanol (15 mL) at 25° C. was treated with a solution of potassium hydroxide (273 mg, 4.88 mmol) in water (2.5 mL) and the solution was stirred at 25° C. After 3 h, the reaction was diluted with water and concentrated under reduced pressure. The concentrate was acidified to pH 2 with an aqueous solution of 1N hydrochloric acid and extracted with dichloromethane (3×15 mL). The combined organic layers were dried over sodium sulfate, filtered and evaporated under reduced pressure. The residual material was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate plus 1% acetic acid) to give rac-(3-chloro-4-methanesulfonyl-phenyl)-(cyclohex-2-enyloxy)-acetic acid (265 mg, 79% yield) as a colorless oil: EI-HRMS m/e calcd for C15H17ClSO5 (M+) 344.0485, found 344.0494.

1. concentrationconcentrated under reduced pressure
2. extractionextracted with dichloromethane (3×15 mL)
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. filtrationfiltered
5. customevaporated under reduced pressure
6. customThe residual material was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 50/50 hexanes/ethyl acetate plus 1% acetic acid)