Organo Photoinduced Decarboxylative Alkylation of Coumarins with <i>N</i>-(Acyloxy)phthalimide
作者:Krishna N. Tripathi、Md. Belal、Ravi P. Singh
DOI:10.1021/acs.joc.9b00977
日期:2020.1.17
A metal-free and mild, photoinduced decarboxylative 4-position alkylation of coumarins has been reported. Photoinduced single electron transfer has been initiated by utilizing the visible-light absorptivity of Eosin Y for a reductive generation of alkyl radicals from N-(acyloxy)phthalimide esters. Depending on the nature of N-(acyloxy)phthalimide esters (primary, secondary, and tertiary carboxylic
已经报道了香豆素的无金属且温和的,光诱导的脱羧4-位烷基化。通过利用曙红Y的可见光吸收率从N-(酰氧基)邻苯二甲酰亚胺酯还原生成烷基自由基,已经引发了光诱导的单电子转移。根据N-(酰氧基)邻苯二甲酰亚胺酯的性质(衍生自伯,仲和叔羧酸),合成了几种饱和和不饱和的C-4烷基化香豆素。对照实验和光物理研究均支持基于自由基的选择性烷基化机理。