反应详情

375 mg (1.88 mmoles) of N-methyl-N-trimethylsilyltrifluoroacetamide were added to a suspension of 387.5 mg (1.16 mmoles) of 7-benzamido-3-methyl-3-cephem-4-carboxylic acid-1-oxide in 40 ml of benzene at room temperature and after stirring at room temperature for half an hour, a clear, yellow solution was obtained. This was cooled to 5° C. and bromination was carried out in half an hour with 306.0 mg (1.72 mmoles) of N-bromosuccinimide as the brominating agent to obtain a 56% yield of trimethylsilyl 7-benzamido-3-bromomethyl-3-cephem-4-carboxylate-1-oxide.

1. customa clear, yellow solution was obtained
2. temperatureThis was cooled to 5° C.