Azetidinone compound and process for preparation thereof

摘要

There is disclosed an azetidinone compound of the formula [I]: <IMAGE> [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 oxygen atom and the like, Y is oxygen atom and the like, and Z is a methylene group which may have substituent(s), which is useful as a synthetic intermediate of the 1 beta -methylcarbapenem-type antibacterial agent. cl CROSS-REFERENCE TO RELATED APPLICATION