Studies on 1-carbadethiacephems, part II: Reaction of 4-acetoxy-2-azetidinone with aluminium enolates

A procedure for the novel reaction of αβ-unsaturated ketones (as zinc-free aluminium enolates) with 4-acetoxy-2-azetidinone, giving products $\text{2}$, is reported. A 1-carbadethia-2-oxocephem derivative $\text{5}$ has been prepared from compound $\text{2b}$.