Copper-Catalysed Asymmetric Conjugate Addition of Organometallic Reagents to Linear Enones
作者:Simon M.W Bennett、Stephen M Brown、Anthony Cunningham、Michael R Dennis、James P Muxworthy、Michael A Oakley、Simon Woodward
DOI:10.1016/s0040-4020(00)00140-x
日期:2000.4
Methods for enantioselective 1,4-addition of main-group organometallics to linear enones are overviewed. Thiourethane and thioether 1,1′-binaphthyl-based ligands are effective for copper-catalysed 1,4-addition of ZnEt2 and AlR3 (R=Me, Et) to trans-alkyl-3-en-2-ones; enantioselectivities of up to 72% e.e. are attained. In comparison 1,4-addition of ZnEt2 to 2-cyclohexenone proceeds in up to 77% e.e
概述了将主族有机金属与线性烯酮进行对映选择性1,4-加成的方法。硫代氨基甲酸酯和硫醚1,1'-联萘基配体对ZnEt 2和AlR 3(R = Me,Et)的铜催化1,4-加成反应生成反-烷基-3-en-2- one有效。对映选择性高达ee的72%。相比之下,在具有相同配体家族的情况下,ZnEt 2向2-环己烯酮的1,4-加成反应最多可产生77%ee。