abstract |
The invention relates to a process for preparing optically active acyloxyazetidinones of the formula (I) in which R 1 is hydrogen or lower alkyl, R 2 is dimethyl (2,3-dimethylbut-2-yl) silyl, R 3 is methyl and R 4 is hydrogen or an amino-protecting group R 4 , and process for their preparation. The compounds of the formula I are used as intermediates in the synthesis of penes. Formula (I) |