发明授权
US3984397A 2,3-Lower alkylenepenam-3-carboxylic acid derivatives and processes for the preparation thereof 失效
2,3-低亚烷基山梨醇-3-羧酸衍生物及其制备方法

2,3-Lower alkylenepenam-3-carboxylic acid derivatives and processes for
the preparation thereof
摘要:
A process for the preparation of ##SPC1##Which comprises reacting ##SPC2##With a base, wherein Y is a residue of an acid, wherein R.sup.1 is amino, (halophenylimino-1-lower alkanoylthiomethyl)amino or acylamino and wherein R.sup.2 is carboxy or a protected carboxy, R.sup.3 is lower alkyl, R.sup.4 is lower alkylene and X is --S-- or ##EQU1##
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