N-Heterocyclic carbene catalyzed base assisted C–C bond cleavage of cyclopropenones: an approach towards diastereoselective synthesis of azetidinones and benzoxazepines

We have demonstrated a synthetic protocol to synthesize two different bio-active skeletons, that is, β-lactam and benzoxazepine by using N-heterocyclic carbene as the catalyst. Herein, 3-membered strained cyclopropenone has been used as a 3C synthon.