Azetidin-2-on derivatives and process for production thereof

Abstract From the Canadian patent

An azetidin-2-one derivative represented by the following formula (I), (I), wherein R1 represents a hydroqen atom a lower alkyl, group, an aryl grouo, an aralkyl group a lower alkoxy, group, aralkoxy group, a lower alkylthio group an aralkyl-, thio group, or a substituted amino group R2 represents, a hydrogen atom, a lower alkyl group an aryl group or an, aralkyl group, and R3 represents a hydrogen atom or a group of the formula, in which R4 represents a hydrogen atom or a protective group for the hydroxyl group; and a process for production thereof. The novel derivatives are useful as intermediates for the production of carbapenem-series antibiotics and monocyclis beta-lactam antibiotics.