3,4-Disubstituted-2-azetidinone derivatives and processes for the preparation thereof.

摘要

3,4-Disubstituted-2-azetidinone derivatives of the formula: in which R<1> is hydrogen or imino-protective group, R<2> is hydroxy(lower)alkyl or protected hydroxy(lower)alkyl R<3> is lower alkyl, and R<4> is 1-(lower)alkyl-1-hydroxy(C2-C6)alkyl, 1-(lower)alkyl-1-(protected hydroxy)(C2-C6)alkyl or 2-thioxothiazolidin-3-yl, and salts thereof and processes for the preparation therof.