Conjugate Addition Reactions of α-Aminoalkylcuprates with α,β-Alkenyl-, α,β-Alkynyl-, α,β−β,γ-Allenyl-, and α,β−γ,δ-Dienyl Carboxylic Acid Derivatives, Nitriles, and Sulfoxides
作者:R. Karl Dieter、Kai Lu、Sadanandan E. Velu
DOI:10.1021/jo0056038
日期:2000.12.1
participate in 1,4-addition reactions with alpha, beta-unsaturated esters, thiol esters, imides, and nitriles in poor to excellent yields depending upon the electron-withdrawing substituent and the substitution pattern of the unsaturated substrate. These reagents also undergo conjugate addition reactions with alpha,beta-alkynyl esters, sulfoxides, and nitriles and with alpha,beta-beta,gamma-unsaturated allenyl
由α-硫代氨基甲酸酯和CuCN.2LiCl制备的α-氨基烷基铜酸酯参与与α,β-不饱和酯,硫醇酯,酰亚胺和腈的1,4-加成反应,取决于吸电子取代基和不饱和底物的取代模式。这些试剂还与α,β-炔基酯,亚砜和腈以及α,β-β,γ-不饱和烯基酯进行共轭加成反应。在α-氨基烷基铜酸酯与烯丙基酯的共轭加成中实现了优异的立体控制,而立体选择性差导致向炔基衍生物的共轭加成。炔基加合物的脱保护和环化反应可得到吡咯烷-2-酮,