What are disclosed are cephem compounds of the formula ##STR1## in which R.sub.1 denotes hydrogen, an optionally substituted alkyl, acyl, arylsulfonyl or alkylsulfonyl group or an amino-protective group which is known from peptide chemistry, R.sub.2 denotes hydrogen or an optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, aralkyl, acyl, aryl, arylsulfonyl, alkylsulfonyl or heterocyclic group, R.sub.3 denotes hydrogen, an ester group or a cation, R.sub.4 denotes hydrogen, a lower alkoxy group or a group which can be converted to this, X denotes a SO group in the R or S configuration or a SO.sub.2 group and A denotes hydrogen, an optionally substituted alkoxy or alkenyloxy group, halogen or a group --CH.sub.2 Y, in which Y represents hydrogen, halogen or the radical of a nucleophilic compound, and in which the R.sub.2 O group is in the syn-position, which compounds are valuable chemotherapeutic agents having a very powerful antimicrobial action against Gram-positive and Gram-negative bacteria and an unexpectedly good action against penicillinase-forming Staphilococci.
所披露的是具有以下结构的
头孢菌素化合物##
STR1## 其中R.sub.1表示
氢,可选择地取代的烷基,酰基,芳基磺酰基或烷基磺酰基,或者是已知的来自肽
化学的
氨基保护基团,R.sub.2表示
氢或可选择地取代的烷基,
烯基,炔基,
环烷基,芳基烷基,酰基,芳基,芳基磺酰基,烷基磺酰基或杂环基团,R.sub.3表示
氢,
酯基或阳离子,R.sub.4表示
氢,较低的烷
氧基团或可转化为此基团的基团,X表示R或S构型的SO基团或SO.sub.2基团,A表示
氢,可选择地取代的烷
氧基或
烯氧基团,卤素或基团--CH.sub.2 Y,其中Y代表
氢,卤素或亲核化合物的基团,且R.sub.2 O基团位于同构体位置,这些化合物是具有非常强大的抗菌作用的有价值的化疗药剂,对革兰氏阳性和阴性细菌均具有作用,并对产
青霉素酶的葡萄球菌表现出出乎意料的良好作用。