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 Y 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.
本发明揭示了一种新的
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Y如规范中所定义,它是合成具有7.alpha.-位置的甲氧基的各种
头孢菌素类抗生素的有用中间体。同时还揭示了制备该化合物的方法。