Atroposelective Synthesis of Axially Chiral Biaryls by Palladium‐Catalyzed Asymmetric C−H Olefination Enabled by a Transient Chiral Auxiliary

Abstract

Abstract Atroposelective synthesis of axially chiral biaryls by palladium‐catalyzed C−H olefination, using tert ‐leucine as an inexpensive, catalytic, and transient chiral auxiliary, has been realized. This strategy provides a highly efficient and straightforward access to a broad range of enantioenriched biaryls in good yields (up to 98 %) with excellent enantioselectivities (95 to >99 % ee ). Kinetic resolution of trisubstituted biaryls bearing sterically more demanding substituents is also operative, thus furnishing the optically active olefinated products with excellent selectivity (95 to >99 % ee , s ‐factor up to 600).