AZETIDINONE COMPOUND AND PROCESS FOR PREPARATION THEREOF

摘要

The present invention is directed to an azetidinone compound of the formula [I]: (see formula I) wherein Ring B is a benzene ring which may have substituent(s), R1 is a hydroxy-substituted lower alkyl group which may have substituent(s), X is an oxygen atom and the like, Y is an oxygen atom and the like, and Z is a methylene group which may have substituent(s). The compound of the present invention is useful as a synthetic intermediate of the 1.beta.-methylcarbapenem-type antibacterial agent.