Direct radical trifluoromethylthiolation and thiocyanation of aryl alkynoate esters: mild and facile synthesis of 3-trifluoromethylthiolated and 3-thiocyanated coumarins

Abstract

A mild and convenient oxidative radical cyclization of aryl alkynoate esters for the synthesis of 3-trifluoromethylthiolated and 3-thiocyanated coumarins has been developed using AgSCF₃ and AgSCN as the corresponding radical sources, respectively. This protocol is characterized by readily available starting materials, excellent functional group tolerance and good yields.