反应详情

A suspension of 5-(tert-butyl-dimethyl-silanyloxy)-1H-indole (9.2 g, 37.2 mmol), ethyl bromoacetate (4.79 ml, 40.9 mmol) and cesium carbonate (36.4 g, 111.5 mmol) in DMF (140 ml) was stirred for 3 h at RT. Diethyl ether was added and the mixture was washed with 1N HCl and water, and dried over sodium sulfate. The ether phase was concentrated under reduced pressure to give 12.9 g (quant.) of [5-(tert-butyl-dimethyl-silanyloxy)-indol-1-yl]-acetic acid ethyl ester which was used in the next step without further purification.

1. washthe mixture was washed with 1N HCl and water
2. dry with materialdried over sodium sulfate
3. concentrationThe ether phase was concentrated under reduced pressure