Recent Asymmetric Phase‐Transfer Catalysis with Chiral Binaphthyl‐Modified and Related Phase‐Transfer Catalysts over the Last 10 Years

Abstract In this personal account, we describe our recent advances in the three types of phase‐transfer catalysis for various transformations including asymmetric induction: Firstly, asymmetric phase‐transfer catalysis with Maruoka‐type C 2 ‐symmetric chiral biaryl‐modified tetraalkylammonium salts and phosphonium salts; Secondly, asymmetric phase‐transfer catalysis under base‐free and neutral conditions; Thirdly, hydrogen‐bonding catalysis using tetraalkylammonium and trialkylsulfonium salts. These three different strategies are illustrated by using various phase‐transfer catalyzed transformations.