Dinuclear Zinc Catalyzed Asymmetric Spirannulation Reaction: An Umpolung Strategy for Formation of α-Alkylated-α-Hydroxyoxindoles
作者:Barry M. Trost、Keiichi Hirano
DOI:10.1021/ol300577y
日期:2012.5.18
A highlydiastereo- and enantioselective formal [3 + 2] cycloaddition of α,β-unsaturated esters and 3-hydroxyoxindoles catalyzed by a dinuclear zinc-ProPhenol complex is reported. The stereoselective Michaeladditions of 3-hydroxyoxindoles and the subsequent transesterifications afford spirocyclic δ-lactones.