A. Basak et U. Khamrai, 4-BENZOYLOXY-2-AZETIDINONE, A CONVENIENT SYNTHON FOR BETA-LACTAM INTERMEDIATES, Synthetic communications, 24(2), 1994, pp. 131-135
4 - Heterosubstituted - 2 - azetidenones were prepared in excellent yi
elds from 4 - benzoyloxy - 2 - azetidenone(4), a much cheaper and stab
ler substrate compared to more common 4 - acetoxy - 2 - azetidenone (2
).