A cephalosporin intermediate of the formula ##STR1## where R.sub.3 is carboxyl, carboxylate, or a carboxylic acid ester group and, R.sub.8 and R.sub.9 are each independently hydrogen, halogen, (C.sub.1-4) alkyl, hydroxy, carboxamido, (C.sub.1-4) alkoxycarbonyl, amino, mono- (C.sub.1-4) alkylamino, di- (C.sub.1-4) alkylamino, or together are a 5 or 6-membered carbocyclic ring or an alkali metal, alkaline earth metal, or acid addition salt thereof. Valuable cephalosporin antibiotics can be produced from the cephalosporin intermediate products of formula I.
一种
头孢菌素的中间体,其
化学式为##STR1##其中R.sub.3是羧基,
羧酸盐或
羧酸酯基,而R.sub.8和R.sub.9各自独立地为氢,卤素,(C.sub.1-4)烷基,羟基,羧酰胺,(C.sub.1-4)烷氧羰基,
氨基,单(C.sub.1-4)烷基
氨基,双(C.sub.1-4)烷基
氨基,或者一起是5或6成员的碳环或其碱
金属,碱土
金属或酸加成盐。从公式I的
头孢菌素中间体产品中可以生产有价值的
头孢菌素抗生素。