Asymmetric Conjugate Addition of Silyl Enol Ethers Catalyzed by Tethered Bis(8-quinolinolato) Aluminum Complexes
作者:Norito Takenaka、Joshua P. Abell、Hisashi Yamamoto
DOI:10.1021/ja0668320
日期:2007.1.1
aluminum(III) complexes effectively catalyze the highly enantioselective Mukaiyama−Michael reaction of silyl enol ethers, including tetrasubstituted enolates that give rise to enantioenriched α-carbonyl all-carbon-substituted quaternary stereocenters. The present catalyst also promotes the conjugate addition of N-benzylindole to α,β-unsaturated acylphosphonates with high enantioselectivity (indole Friedel−Crafts
新的手性系链双(8-羟基喹啉)(TBOx)铝(III)配合物有效催化甲硅烷基烯醇醚的高度对映选择性 Mukaiyama-Michael 反应,包括产生对映体富集的 α-羰基全碳取代四元立体中心的四取代烯醇化物。本催化剂还促进了 N-苄基吲哚与具有高对映选择性的 α,β-不饱和酰基膦酸酯的共轭加成(吲哚 Friedel-Crafts 烷基化反应)。