申请人:Bayer Aktiengesellschaft
公开号:US04500716A1
公开(公告)日:1985-02-19
Highly active substantially pure Z-isomers of cephalosporins are produced by the following synthesis: ##STR1## in which R.sup.1, R.sup.4 and R.sup.5 ae various organic radicals, R.sup.2 is alkoxycarbonyl, Y is Cl, Br or --O--SO.sub.2 --R.sup.5, and X is a conventional cephalosporin substituent. Many of the intermediates are new, especially in pure Z-form.
头孢菌素的高活性基本纯Z异构体通过以下合成产生:其中R.sup.1、R.sup.4和R.sup.5是各种有机基团,R.sup.2是烷氧羰基,Y是Cl、Br或--O--SO.sub.2 --R.sup.5,X是传统的头孢菌素取代基。许多中间体是新的,特别是纯Z形式。