Phosphine-catalyzed asymmetric [4+1] annulation of activated α,β-unsaturated ketones with Morita–Baylis–Hillman carbonates: enantioselective synthesis of spirooxindoles containing two adjacent quaternary stereocenters
作者:Fang-Le Hu、Yin Wei、Min Shi
DOI:10.1039/c4cc03479a
日期:——
The asymmetric [4+1] annulation of activated alpha,beta-unsaturated ketones with MBHcarbonates catalyzed by bifunctional thiourea-phosphine catalysts derived from an axially chiral binaphthyl scaffold has been developed, giving spirooxindoles with two adjacent quaternary stereocenters in good yields with high enantioselectivities and moderate diastereoselectivities under mild conditions.