反应详情

A solution of ethyl 2,3-dibromo-4-(3,4-dimethoxyphenyl)-4-oxobutanoate (4.76 g, 11.2 mmol), prepared above, in methylene chloride (20 ml) and a solution of triethylamine (4 g) in methylene chloride (5 ml) were subjected to reaction and treatment in the same manner as described above in connection with Intermediate 1. The crude product was purified by column chromatography on silica gel (hexane/ethyl acetate) to give the title compound (2.4 g, 82%) as a yellow crystal.

1. customThe crude product was purified by column chromatography on silica gel (hexane/ethyl acetate)