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 regioselectivesynthesis 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