A racemic synthesis of two diastereoisomeric alpha -benzyloxycarbonylamino
substituted trans-fused bicyclic lactams (4 and 5), was achieved from cyclo
pentene oxide. These lactams are useful intermediates to investigate the po
ssibility of using a trans-lactam template as a replacement for the beta -l
actam ring found in conventional antibacterial agents. One of the intermedi
ates (4) was further elaborated to an analogue of the antibacterial agent c
eftazidime.