反应详情

温度

25 °C

A solution of rac-cyclopentyloxy-(3,4-dichloro-phenyl)-acetic acid methyl ester (266 mg, 0.877 mmol) in ethanol (10 mL) was treated with a solution of potassium hydroxide (123 mg, 2.19 mmol) in water (1 mL) and the mixture was stirred at 25° C. After 3 h, the reaction was diluted with water (5 mL) and the ethanol was removed in vacuo. The aqueous layer was then acidified to pH 2 with 1 N 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 residue was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 chloroform/methanol plus 1% acetic acid) to afford rac-cyclopentyloxy-(3,4-dichloro-phenyl)-acetic acid (223 mg, 88% yield) as a white solid, mp 87.5-89.9 IC; EI-HRMS m/e calcd for C13H14Cl2O3 (M+) 288.0320, found 288.0332.

1. customthe ethanol was removed in vacuo
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 residue was purified by flash chromatography (Merck Silica gel 60, 230-400 mesh, 95/5 chloroform/methanol plus 1% acetic acid)