反应详情

Difluoro-(4′-methoxy-biphenyl-4-yl)-acetic acid ethyl ester. Diethylaminosulfur trifluoride (5 mL) is added directly to (4′-methoxy-biphenyl-4-yl)-oxo-acetic acid ethyl ester (3.77 g, 13.3 mmol), prepared as described by Neidlin, et. al., Arzneim.-Forsch. 1983, 33, 691-3. Dichloromethane (2 mL) is added and the mixture is stirred overnight at room temperature. The reaction is diluted with dichloromethane and slowly added to ice water. This mixture is extracted with ethyl acetate twice. The combined organic extracts are dried over Na2SO4, filtered, and concentrated under reduced pressure. The crude product is purified by column chromatography (silica gel, 5% EtOAc/hexanes) to give the desired product as a pale yellow solid.

1. customprepared
2. extractionThis mixture is extracted with ethyl acetate twice
3. dry with materialThe combined organic extracts are dried over Na2SO4
4. filtrationfiltered
5. concentrationconcentrated under reduced pressure
6. customThe crude product is purified by column chromatography (silica gel, 5% EtOAc/hexanes)