AZETIDINONE COMPOUNDS

摘要

PCT No. PCT/JP83/00315 Sec. 371 Date May 22, 1984 Sec. 102(e) Date May 22, 1984 PCT Filed Sep. 24, 1983 PCT Pub. No. WO84/01152 PCT Pub. Date Mar. 29, 1984.An azetidinone compound represented by the formula (I) wherein R1 represents a substituted or unsubstituted phenyl group, R2 represents a carboxyl-protecting group, X represents a hydrogen atom or chlorine atom and Y represents -I, -ONO2, -OH, or -SR4 in which R3 is a lower alkyl group or -OR5 (wherein R5 is a halogen-containing lower alkyl group) and R4 is a substituted or unsubstituted, 5-membered aromatic heterocyclic residue containing sulphur and/or nitrogen atom or atoms.