Disclosed is a novel cephem compound represented by the formula: ##STR1## wherein R.sup.1, R.sup.2, R.sup.3, R.sup.4 and n are as defined in the specification, which is a useful intermediate for synthesizing various cephalosporin antibiotics having a methoxy group at the 7.alpha.-position thereof. Also disclosed is a process for preparing the same.
本发明公开了一种新的
头孢菌素化合物,其
化学式为:##STR1## 其中,R.sup.1,R.sup.2,R.sup.3,R.sup.4和n如规范中所定义,该化合物是合成具有7α位甲氧基
头孢菌素类抗生素的有用中间体。同时,本发明还公开了制备该化合物的方法。