A compound of the formula: ##STR1## wherein R.sup.1 stands for a halogenoethoxycarbonylamino and R.sup.2 stands for hydrogen or a halogen, is an important intermediate for producing a cephalosporin derivative of the formula: ##STR2## wherein R.sup.3 stands for methyl, acetoxymethyl, carbamoyloxymethyl, an alkoxymethyl, an alkylthiomethyl, 2-carboxy-1-ethenyl, or a heterocyclic thiomethyl, R.sup.5 stands for hydrogen or methoxy and R.sup.2 has the same meaning as defined before, which is active against various pathogenic microorganisms even at a low concentration.
化合物的公式为:##STR1## 其中R.sup.1代表卤代乙氧羰基
氨基,R.sup.2代表氢或卤素,是生产
头孢菌素衍
生物的重要中间体,该衍
生物的公式为:##STR2## 其中R.sup.3代表甲基、乙酰氧甲基、
氨甲酰氧甲基、烷氧甲基、烷基
硫甲基、2-羧基-
1-乙烯基或杂环
硫甲基,R.sup.5代表氢或甲氧基,R.sup.2具有前面定义的相同含义,即使在低浓度下也对各种病原微
生物具有活性。