Visible-Light-Induced Tandem Radical Brominative Addition/Cyclization of Activated Alkynes with CBr<sub>4</sub> for the Synthesis of 3-Bromocoumarins
作者:Chen-Yang Yan、Zheng-Wei Wu、Xiao-Yu He、Yu-Hong Ma、Xiao-Rong Peng、Long Wang、Qing-Qing Yang
DOI:10.1021/acs.joc.2c01721
日期:2023.1.6
A visible-light-induced tandem radical brominative addition/spiro-cyclization/1,2-ester migration of activated alkynes with CBr4 is developed. This protocol features good functional group tolerance, operational simplicity, and mild reaction conditions without the use of catalysts and external additives, providing easy access to valuable 3-bromocoumarins in generally high yields.
开发了可见光诱导的串联自由基溴化加成/螺环化/1,2-酯迁移的活化炔烃与 CBr 4。该协议具有良好的官能团耐受性、操作简单和温和的反应条件,无需使用催化剂和外部添加剂,可以轻松获得具有普遍高产率的有价值的 3-溴香豆素。