申请人:Fujisawa Pharmaceutical Co., Ltd.
公开号:US04091210A1
公开(公告)日:1978-05-23
A new process for preparing 3-alkyl-3-cephem-4-carboxylic acids of the general formula: ##STR1## wherein R.sub.1 is amino or a substituted amino, R.sup.2 is carboxy or a protected carboxy and R.sup.3 is a lower alkyl, and New intermediates of the general formula: ##STR2## wherein R.sup.1, R.sup.2 and R.sup.3 are each as defined above and Y' is a residue of ammonia or a saturated aliphatic amine or a secondary cyclic amine, comprises reacting a compound of the formula ##STR3## wherein X is a residue of a thiol compound, with a condensing agent or a polar solvent, or with ammonia or an amine, respectively. In the latter case, the resultant new intermediate may further be reacted with a condensing agent or a polar solvent to form a 3-alkyl-3-cephem-4-carboxylic acid as above.
一种用于制备一般式为:##STR1##其中R.sub.1是氨基或取代氨基,R.sup.2是羧基或保护羧基,R.sup.3是较低的烷基的3-烷基-3-头孢烷-4-羧酸的新工艺,以及一般式为:##STR2##其中R.sup.1、R.sup.2和R.sup.3如上定义,Y'是氨或饱和脂肪族胺或次级环胺的残基的新中间体,包括将化合物的反应式##STR3##其中X是硫醇化合物的残基,与缩合剂或极性溶剂或氨或胺分别反应。在后一种情况下,所得到的新中间体还可以进一步与缩合剂或极性溶剂反应,以形成上述的3-烷基-3-头孢烷-4-羧酸。