An Intramolecular [2 + 2] Cycloaddition of Ketenimines via Palladium‐Catalyzed Rearrangements of N‐Allyl‐Ynamides.

Treatment of N-allyl-ynamides of type (I), (IV), (IX), and (XI) with Pd(PPh3)4 results in formation of bridged or fused bicycloimines depending on the alkene substitution.