反应详情

A solution of 2-(2-formamidothiazol-4-yl)-2-(2,2,2-trifluoroethoxyimino)acetic acid (syn isomer, 0.9 g.), N,N-dimethylformamide (0.24 g.) and phosphoryl chloride (0.5 g.) in ethyl acetate (10 ml.) and a solution of 4-nitrobenzyl 7-amino-3-chloro-3-cephem-4-carboxylate hydrochloride (1.23 g.) and trimethylsilylacetamide (2.8 g.) in ethyl acetate (20 ml.) were treated in a similar manner to that of Example 21-(1) to give 4-nitrobenzyl 7-[2-(2-formamidothiazol-4-yl)-2-(2,2,2-trifluoroethoxyimino)acetamido]-3-chloro-3-cephem-4-carboxylate (syn isomer, 1.9 g.).