NEW BETA-LACTAM ACETIC ACID DERIVATIVES,THE PROCESS FOR PREPARING THEM,AND THEIR USE AS INTERMEDIATES FOR 1-AZABICYCLO(3.2.0)HEPT-2-ENE ANTIBIOTICS

摘要

New beta -lactam acetic acid derivatives I IMAGE I wherein R represents alkyl, alkyl substituted with amino, protected amino, mono- or di-alkylamino, hydroxy, protected hydroxy or alkoxy, and alkenyl, and their salts are useful as intermediates for preparing 1-azabicyclo [3.2.0]hept-2-ene antibiotics II IMAGE II The process for preparing the beta -lactam acetic acid derivatives I as well as the overall process which starting from the acids I leads to the antibiotics II are also claimed.