A Straightforward Synthesis of Cyclobutenones via a Tandem Michael Addition/Cyclization Reaction of 2,3-Allenoates with Organozincs
作者:Guobi Chai、Shangze Wu、Chunling Fu、Shengming Ma
DOI:10.1021/ja1108694
日期:2011.3.23
polysubstituted cyclobutenones, which are not readily available from traditional methods due to the intrinsic ring strain, is described. The reaction of 2,3-allenoates and organozinc reagents proceeds via a tandem Michael addition/cyclic 1,2-addition/elimination mechanism with the functional groups from the organozinc reagents being introduced to the 3-position of the cyclobutenone products regiospecifically
描述了一种合成多取代环丁烯酮的有效方法,由于固有的环应变,这些方法不易从传统方法中获得。2,3-烯丙酸酯和有机锌试剂的反应通过串联迈克尔加成/环状 1,2-加成/消除机制进行,来自有机锌试剂的官能团被区域特异性地引入环丁烯酮产物的 3-位优良的产量。演示了在立体定义的 β,γ-不饱和烯酮的合成中的应用。