Organocatalytic Enantioselective Vinylogous Michael Reaction of Vinylketene Silyl-<i>N,O</i>-Acetals
作者:Smita Basu、Vaishali Gupta、Johannes Nickel、Christoph Schneider
DOI:10.1021/ol403275k
日期:2014.1.3
The enantioselective vinylogous Michael reaction of vinylketene silyl N,O-acetals derived from α,β-unsaturated N-acyl pyrroles and a broad range of α,β-unsaturated aldehydes proceeds with good regio-, diastereo-, and enantioselectivity when the Hayashi–Jørgensen diphenylprolinolsilylether was employed as a chiral organocatalyst. Products were obtained in generally good yields and as single stereoisomers
vinylketene甲硅烷基的对映选择性插烯迈克尔反应N,O -acetals从α,β不饱和衍生Ñ酰基吡咯和宽范围的α,β不饱和醛具有良好的区域选择性,diastereo-,和对映选择性当Hayashi-前进约根森二苯基脯氨醇甲硅烷基醚用作手性有机催化剂。在色谱纯化后,以非常高的光学纯度,通常以良好的收率和单一立体异构体的形式获得产物。它们很容易衍生为一组有用的合成构件。