Regioselective cyclization of 2-alkynylbenzoic acid in water for the synthesis of isocoumarin
作者:Yan-Hua Wang、Guanyinsheng Qiu、Hongwei Zhou、Wenlin Xie、Jin-Biao Liu
DOI:10.1016/j.tet.2019.06.012
日期:2019.7
In this work, a regioselective synthesis of isocoumarins from 2-alkynylbenzoic acid is reported. The transformations proceed smoothly with good yields in water via a metal-free radical pathway. When catalytic TBAB is employed, the reaction provides various isocoumarin derivatives according to the structures of the corresponding precursors. It is believed that TBAB serves as a phase transfer catalyst
在这项工作中,据报道由2-炔基苯甲酸区域选择性合成异香豆素。通过金属自由基途径,转化过程顺利进行,并在水中产生高收率。当使用催化TBAB时,反应根据相应前体的结构提供各种异香豆素衍生物。据信TBAB在反应中用作相转移催化剂和自由基引发剂。与以前的方法相比,本文报道的合成方法为异香豆素的合成提供了更环境友好的途径。