A compound represented by the formula ##STR1## wherein R.sub.1 represents a lower alkyl group or a lower haloalkyl group; R.sub.2 represents a lower alkyl group, a lower haloalkyl group, an aralkyl group, or a group of the formula --COOR.sub.4 or --SO.sub.2 R.sub.5 in which R.sub.4 represents an alkyl group or a substituted or unsubstituted aralkyl group and R.sub.5 represents an alkyl group or a substituted or unsubstituted aryl group; and R.sub.3 represents a hydrogen atom or a carboxyl protecting group which can be easily split off. This compound is useful in the production of a 6-(disubstituted amino)carbapenem-series antibiotic.
公式表示的化合物为##STR1##其中R.sub.1代表较低的烷基或较低的卤代烷基;R.sub.2代表较低的烷基、较低的卤代烷基、芳基烷基或具有公式--COOR.sub.4或--SO.sub.2R.sub.5的基团,其中R.sub.4代表烷基或取代或未取代的芳基烷基,R.sub.5代表烷基或取代或未取代的芳基;而R.sub.3代表氢原子或可轻松分离的羧基保护基团。该化合物在生产6-(二取代
氨基)卡巴胺系抗生素方面有用。