Palladium-Catalyzed Regioselective [3 + 2] Annulation with N-Allenamides at the Proximal C═C Bond: Synthesis of γ-Amino-α′-methylenecyclopentenones

-allenamides as versatile 2C synthons enables simultaneous incorporation of both a nitrogen atom and a methylene group into cyclopentenones. Furthermore, this approach exhibits reverse regioselectivity when compared to general allenes. Density functional theory calculations successfully elucidated the origin of the observed regioselectivity.