Synthesis of pyrrolo[2,3-a]pyrrolizine and pyrrolizine[2,3-a]pyrrolizine derived from allyl derivatives of Baylis–Hillman adducts through intramolecular 1,3-dipolar cycloaddition

The synthesis of a series of pyrrole-based polycyclic heterocycles has been accomplished through an intramolecular 1,3-dipolar cycloaddition reaction of an azomethine ylide with the dipolarophile derived from Baylis–Hillman adducts. Improved yields of the products were obtained when the reaction was carried out under microwave conditions.