| 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. |
