Phosphine-Catalyzed Highly Enantioselective [3 + 3] Cycloaddition of Morita—Baylis—Hillman Carbonates with C,N-Cyclic Azomethine Imines.

The asymmetric [3 + 3] cycloaddition of C,N-cyclic azomethine imines with aryl-substituted Morita—Hillman carbonates (II, IV) is developed using a spirocyclic chiral phosphine as the catalyst.