Stereodivergent Coupling of 1,3-Dienes with Aldimine Esters Enabled by Synergistic Pd and Cu Catalysis

Herein we describe the use of synergistic Pd and Cu catalysis for stereodivergent coupling reactions between 1,3-dienes and aldimine esters. By using different enantiomers of the two metal catalysts, all four stereo-isomers of the coupling products, which have two vicinal stereocenters, could be accessed with high diastereo- and enantioselectivity. This atom-economical cross-coupling reaction has a wide substrate scope and good functional group tolerance. Our work highlights the power of synergistic catalysis for asymmetric coupling reactions involving Pd-hydride catalysts.