反应详情

The compound ethyl 3-phenyl-3-(6-hydroxyindol-3-yl)propionate 4 prepared analogously to Example 1.1-1.3 (3.23 mmol) is stirred overnight at 60° C. with 0.94 ml (6.4 mmol) of tert-butyl bromoacetate and 1.8 g (13 mmol) of potassium carbonate in 20 ml of acetone. When the reaction is complete (TLC check toluene/acetone 4:1), the residue is filtered off, the solution is evaporated, and the crude product is purified by chromatography on silica gel (eluent toluene/acetone 9:1), giving ethyl 3-phenyl-3-[6-(tert-butoxycarbonylmethoxy)indol-3-yl]propionate.

1. filtrationthe residue is filtered off
2. customthe solution is evaporated
3. customthe crude product is purified by chromatography on silica gel (eluent toluene/acetone 9:1)