This invention relates to novel 4-substituted-2-oxoazetidine compounds and salts thereof, which are useful intermediates in the preparation of antibiotics having the fundamental skeleton of Thienamycin, which compounds are of the formula: ##STR1## in which R.sup.1 is halogen, isocyano, hydroxy(lower)alkyl or protected hydroxy(lower)alkyl, R.sup.2 is hydrogen or lower alkyl optionally substituted by carboxy or protected carboxy, and R.sup.3 is carboxy or a protected carboxy group, or a base salt thereof.
本发明涉及新型的4-取代-2-
氧代
氮杂
环丁烷化合物及其盐,这些化合物作为制备具有
硫氮杂霉素基本骨架的
抗生素的有用
中间体,其化合物具有以下公式:##
STR1## 其中R.sup.1是卤素、异
氰基、羟基(低级)烷基或受保护的羟基(低级)烷基,R.sup.2是
氢或可被羧基或受保护的羧基取代的低级烷基,R.sup.3是羧基或受保护的羧基团,或其碱盐。