Enantioselective Synthesis of Chiral Acyclic Nitriles Containing α-All-Carbon Quaternary Stereocenters via Synergistic Palladium and Phase-Transfer Catalysis

Abstract

Herein, we present a practical strategy for the asymmetric synthesis of chiral acyclic nitriles featuring α-all-carbon quaternary stereocenters, utilizing synergistic palladium and phase-transfer catalysis from allyl 2-cyanoacetates under mild conditions. This approach offers an efficient and reliable method for the in situ generation of tertiary α-cyano carbanions through intramolecular palladium-catalyzed decarboxylative allylic alkylation. Additionally, it enables highly enantioselective control of simple nitriles via ion-pairing interactions with chiral phase-transfer catalysts. The synthetic utility of this method is further demonstrated by its scalability to gram-scale synthesis and its subsequent transformation into a variety of chiral functionalized compounds containing acyclic all-carbon quaternary stereocenters.