Copper(I)-Catalyzed Asymmetric Pinacolboryl Addition of N-Boc-imines Using a Chiral Sulfoxide–Phosphine Ligand
摘要:
Highly efficient and enantioselective copper(I)-catalyzed pinacolboryl addition of N-Boc-imines is reported. By using a single chiral sulfoxide-(dialkyl)phosphine (SOP) ligand, both enantiomeric isomers of alpha-amino boronic esters were obtained through an achiral counteranion switch.
Catalytic asymmetric addition of arylboronic acids to N-Boc imines generated in situ using C2-symmetric cationic N-heterocyclic carbenes (NHCs) Pd2+ diaquo complexes
作者:Zhen Liu、Min Shi
DOI:10.1016/j.tet.2010.02.037
日期:2010.4
The catalytic asymmetricaddition of arylboronicacids to N-Boc imines generated in situ from stable and easily prepared α-carbamoyl sulfones was realized by using chiral cationic C2-symmetric N-heterocyclic carbene (NHC) Pd2+ diaquo complexes 1a–c as the catalysts, producing the corresponding adducts in good to high yields (up to 89%) and good to high enantioselectivities (up to 90% ee).