Rhodium-Catalyzed Enantioselective Conjugate Addition of Sodium Tetraarylborates to 2,3-Dihydro-4-pyridones and 4-Quinolones by Using (R,R)-1,2-Bis(tert-butylsulfinyl)benzene as a Ligand

摘要

(R,R)-1,2-Bis(tert-butylsulfinyl)benzene as an efficient and simple ligand can be applied in the rhodium-catalyzed asymmetric 1,4-addition of sodium tetraarylborate reagents to N-substituted 2,3-dihydro-4-pyridones and 4-quinolones. The reactions proceeded smoothly to provide the corresponding adducts in good yields (up to 92%) and excellent enantioselectivities (up to 99% ee) under mild conditions.