tert‐Butanesulfinylphosphines: Simple Chiral Ligands in Rhodium‐Catalyzed Asymmetric Addition of Arylboronic Acids to Electron‐Deficient Olefins

An efficient rhodium complex catalyst system was developed by using a class of simple tert ‐butanesulfinylphosphines as bidentate ligands, which solely bear sulfur chirality and combine the advantages of both sulfoxide and phosphine ligands. Excellent activities (in 0.5 hour, up to 99% yield) and enantioselectivities (up to 98% ee ) were displayed in Rh‐catalyzed asymmetric 1,4‐additions under mild conditions.