Diethyl Ether → (E)-2-[2-[3-[2-[4-(cyclobutyl)-2-thiazolyl]ethenyl]phenylamino]-2-oxoethyl]benzoic acid methyl ester

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A suspension of 2.1 g of (E)-2-[2-[3-[2-[4-(cyclobuty)-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. Anal. Calcd for C25H24N2O3S: C, 69.42; H, 5.59; N, 6.48. Found: C, 69.21; H, 5.63; N, 6.49.

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