| 摘要 |
<p>An azetidinone derivative represented by the formula (I) <IMAGE> (I) wherein R1 is substituted or unsubstituted phenyl or substituted or unsubstituted phenoxy, R2 is hydrogen, optionally substituted hydrocarbon residue or aminoprotecting group selected from acyl, silyl, sulfonyl and phosphonyl derived from organic or inorganic acid, <IMAGE> (wherein R3 is hydrogen or lower alkyl), X1 and X2 are the same or different and are halogen, hydroxyl, alkoxy, acyloxy, SR4 (wherein R4 is straight chain or branched chain lower alkyl substituted or unsubstituted, substituted or unsubstituted phenyl or substituted or unsubstituted heterocyclic group), amino or hydrogen, one of X1 and X2 being hydrogen when the other is not, and R5 is substituted or unsubstituted phenyl or substituted or unsubstituted heterocyclic group, and a process for preparing the same.</p> |
