The invention relates to a novel method for the preparation of a 7.beta.-acylamido-3-bromomethylceph-3-em-4-carboxylic acid-1-oxide compound by brominating a 7.beta.-acylamido-3-methylceph-3-em-4-carboxylic acid-1-oxide compound.
本发明涉及一种新型方法,通过对7β-酰胺基-3-甲基头孢-3-氧-4-
羧酸-1-氧化物化合物进行
溴化反应制备7β-酰胺基-3-
溴甲基头孢-3-氧-4-
羧酸-1-氧化物化合物。