Synthesis of chiral S , N -thioimidazoline ligands for palladium-catalyzed asymmetric allylic alkylations
摘要:
A series of chiral S,N-thioimidazoline ligands have been synthesized using 2-bromobenzoic acid or 1-bromo-2-naphthoic acid as starting materials. The obtained ligands were evaluated in the Pd-catalyzed asymmetric allylic alkylations and exhibited high catalytic efficiency: yields of up to 94% and enantioselectivities of up to 86% were achieved under the optimized conditions. (C) 2016 Elsevier Ltd. All rights reserved.