| abstract |
(57) [Summary] [Object] The present invention is an intermediate used for the production of a novel 3- (substituted or unsubstituted) amino-2-oxo-1-azetidinesulfonic acid derivative [beta-lactam antibiotic] having antibacterial activity. A body compound is provided. The intermediate compound of the present invention has the formula: (In the formula, R 2 is hydrogen or alkoxy having 1 to 4 carbon atoms; R 3 And R 4 are the same or different and each represents hydrogen, alkyl, cycloalkyl, phenyl or substituted phenyl, or one of R 3 and R 4 is hydrogen, the other is alkoxycarbonyl, alkene-1-yl, alkyne- 1-yl, 2-phenylethenyl or 2-phenylethynyl). |