Novel 1-dethia-2-thia-cephalosporanic acid derivatives of the formula ##STR1## wherein R is selected from the group consisting of ##STR2## Ra is an organic radical, R.sub.i and R.sub.j are individually selected from the group consisting of hydrogen, aliphatic, aromatic and heterocycle or taken together with the nitrogen atom to which they are attached form an optionally substituted cycle or R.sub.b NH--, R.sub.b is optionally substituted carbocyclic or heterocyclic aryl, R.sub.1 and --COM are as defined in the specification, R.sub.4 is hydrogen or methoxy, n.sub.2 is 0, 1 or 2 and their non-toxic, pharmaceutically acceptable acid addition salts in racemic or optically active form having antibiotic activity and their preparation and novel intermediates.
1-德西亚-2-
硫代
头孢菌素酸衍
生物的新颖式样的分子式为##
STR1## 其中R选自##
STR2## Ra是有机基团,R.sub.i和R.sub.j分别选自
氢、
脂肪、芳香和杂环的群,或者与它们附着的
氮原子一起形成一个可选取代的环,或者R.sub.b NH--,R.sub.b是可选取代的
碳环或杂环芳基,R.sub.1和--COM如规范所定义,R.sub.4是
氢或甲
氧基,n.sub.2为0、1或2,它们的无毒、药用可接受的酸盐以拉丁或光学活性形式具有
抗生素活性,并且它们的制备和新颖
中间体。