Stereoselective reactions. IX. Synthetic studies on optically active .BETA.-lactams. I. Chiral synthesis of carbapenam and carbapenem ring systems starting from (S)-aspartic acid.
Stereoselective reactions. IX. Synthetic studies on optically active .BETA.-lactams. I. Chiral synthesis of carbapenam and carbapenem ring systems starting from (S)-aspartic acid.