Vinylogous Mannich-Type Reaction Catalyzed by an Iodine-Substituted Chiral Phosphoric Acid

2‐Trimethylsiloxyfuran underwent a vinylogous Mannich‐type reaction with aldimines under the action of a new chiral phosphoric acid, bearing iodine on the 6,6′‐positions of the binaphthyl group, as a chiral Brønsted acid to give γ‐butenolide derivatives bearing an amino functionality with high diastereo‐ and enantioselectivity.