Simple chiral crown ethers complexed with potassium tert-butoxide as efficient catalysts for asymmetric Michael additions
作者:Shin Aoki、Shigeki Sasaki、Kenji Koga
DOI:10.1016/s0040-4039(01)93942-5
日期:1989.1
Simple C2-symmetric chiral crown ether 1 complexed with KOtBu was found to work as an efficient chiral catalyst in Michaeladditions to cause high asymmetric induction. The results with various chiral crown ethers as catalysts suggest that diaxial-like conformation of the vicinal methyl groups of 1·potassium enolate complex is responsible for the chiral induction.
发现简单的C 2对称手性冠醚1与KO t Bu络合可在迈克尔加成反应中作为有效的手性催化剂,引起高度不对称诱导。用各种手性冠醚作为催化剂的结果表明1 ·烯醇钾复合物的邻位甲基的双轴样构象是手性诱导的原因。