Photosensitised regioselective [2+2]-cycloaddition of cinnamates and related alkenes
作者:Santosh K. Pagire、Asik Hossain、Lukas Traub、Sabine Kerres、Oliver Reiser
DOI:10.1039/c7cc06710k
日期:——
An efficient method for the synthesis of substituted cyclobutanes from cinnamates, chalcones, and styrenes has been developed utilizing a visible-light triplet sensitisation mode. This reaction provides a diverse range of substituted cyclobutanes in high yields under mild conditions without the need of external additives. Good regioselectivity is obtained due to strong π–π-stacking of arene moieties
利用可见光三重态敏化模式已经开发了一种从肉桂酸酯,查耳酮和苯乙烯合成取代环丁烷的有效方法。该反应在温和条件下无需外部添加剂即可高收率地提供各种范围的取代的环丁烷。良好的区域选择性是由于芳烃部分的强烈π-π堆积而获得的,而非对映选择性则取决于芳烃底物的电子效应或邻位取代。木质素天然产物(±)-丹哥酚的形式合成证明了这种转化的效用。