作者:Sung Soo Kim、Dae Ho Song
DOI:10.1002/ejoc.200400721
日期:2005.5
Various aldehydes undergo asymmetric trimethylsilylcyanation with (CH3)3SiCN (TMSCN) in the presence of a chiral Al(salen) complex and Ph3PO as the catalyst. This is a double activation where Al(salen) plays the role of Lewis acd and POPh3 acts as a Lewis base. Various kind of aldehydes were subjected to the enantioselective addition of (CH3)3SiCN at temperatures between –40 °C and –50 °C. Hydrolysis
在手性 Al(salen) 配合物和 Ph3PO 作为催化剂的存在下,各种醛与 (CH3)3SiCN (TMSCN) 发生不对称三甲基甲硅烷基氰化反应。这是一种双重激活,其中 Al(salen) 扮演路易斯 acd 的角色,而 POPh3 充当路易斯碱。在–40 °C 和–50 °C 之间的温度下,对各种醛进行了(CH3)3SiCN 的对映选择性加成。在大多数情况下,加合物的水解产生超过 90% 产率和 80% ee 的氰醇。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2005)