反应详情

2-(2-Formamidothiazol-4-yl)-2-(2-tert-butoxycarbonylaminoethoxyimino)acetic acid (syn isomer, 2 g.), N,N-dimethylformamide (0.45 g.), phosphoryl chloride (1.03 g.), 7-amino-3-(5-tert-butoxycarbonylaminomethyl 1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (2.6 g.), trimethylsilylacetamide (5.9 g.) and bis(trimethylsilyl)acetamide (3.4 g.) and ethyl acetate (50 ml.) were treated in a similar manner to that of Example 6-(1) to give 7-[2-(2-formamidothiazol-4-yl)-2-(2-tert-butoxycarbonylaminoethoxyimino)acetamido]-3-(5-tert-butoxycarbonylaminomethyl-1,3,4-thiadiazol-2-yl)thiomethyl-3-cephem-4-carboxylic acid (syn isomer, 4.0 g.).