Rhodium(I)‐Catalyzed [4+1] Cycloaddition Reactions of α,β‐Unsaturated Imines with Terminal Alkynes for the Preparation of Pyrrole Derivatives

This is the authors' abstract. We don't add key points for this paper.

Rhodium vinylidene intermediates are characteristic for the title reaction (see scheme; coe=cyclooctene, cy=cyclohexyl). This reaction proceeds by the nucleophilic addition of the nitrogen atom of the imine to the rhodium vinylidene complex to give a zwitterionic intermediate, which undergoes intramolecular cyclization to afford the corresponding pyrrole.