Enantioselective Organocatalytic Diels-Alder Trapping of Photochemically Generated Hydroxy-<i>o</i>
-Quinodimethanes
作者:Luca Dell'Amico、Alberto Vega-Peñaloza、Sara Cuadros、Paolo Melchiorre
DOI:10.1002/anie.201509472
日期:2016.3.1
generated hydroxy‐o‐quinodimethanes with high stereoselectivity. We used a chiral organic catalyst, derived from natural cinchona alkaloids, to activate maleimides toward highly stereoselective Diels–Alder reactions. An unconventional mechanism of stereocontrol is operative, wherein the organocatalyst is actively involved in both the photochemical pathway, by leveraging the formation of the reactive photoenol
光化/ Diels-Alder策略可直接获得具有合成价值的苯环化碳环产品。这个历史悠久的光触发过程从未屈服于开发对映选择性催化方法的努力。本文中,我们证明了不对称有机催化如何提供简单而有效的催化工具来拦截光化学生成的羟基邻苯二酚。具有高立体选择性的喹啉甲烷。我们使用了衍生自天然金鸡纳生物碱的手性有机催化剂,将马来酰亚胺活化为高度立体选择性的Diels-Alder反应。一种非常规的立体控制机制是有效的,其中有机催化剂通过利用反应性光烯醇的形成和立体选择性定义事件而积极地参与了光化学途径。