反应详情

A suspension of 2.1 g of (E)-2-[2-[3-[2-[4-(cyclobutyl)-2-thiazolyl]ethenyl]phenylamino]-2-oxoethyl]benzoic acid in 200 ml of ethyl ether/methylene chloride (1:3 v/v) was treated with an excess of an ethyl ether solution of diazomethane. After 10 min the excess of diazomethane was removed with a stream of nitrogen, the remaining solvents were removed in vacuo and the residual materials were taken up into methylene chloride. This solution was washed with water (2×15 ml) and dried (MgSO4). Removal of the volatiles in vacuo and recrystallization from ethyl acetate yielded 2.2 g of (E)-2-[2-[3-[2-[4-(cyclobutyl)-2-thiazolyl]ethenyl]phenylamino]-2-oxoethyl]benzoic acid methyl ester as an off-white solid, m.p. 143°-144° C.

1. customAfter 10 min the excess of diazomethane was removed with a stream of nitrogen
2. customthe remaining solvents were removed in vacuo
3. washThis solution was washed with water (2×15 ml)
4. dry with materialdried (MgSO4)
5. customRemoval of the volatiles
6. customin vacuo and recrystallization from ethyl acetate