A New Synthesis of Benzo[<i>b</i>]thiophene-2-thiolates and Their Derivatives <i>via</i> Base-Promoted Transformation of 4-(2-Mercaptophenyl)-1,2,3-thiadiazoles
作者:Fedor S. Teplyakov、Tatiana G. Vasileva、Mikhail L. Petrov、Dmitry A. Androsov
DOI:10.1021/ol401981w
日期:2013.8.2
A reaction of 4-(2-mercaptophenyl)-1,2,3-thiadiazoles with an oxidant in the presence of 1.1 equiv of base afforded good yields of benzo[4,5]thieno[3,2-d][1,2,3]thiadiazoles via the intramolecular oxidative nucleophilic substitution of a hydrogen (ONHS) pathway. The reaction of 4-(2-mercaptophenyl)-1,2,3-thiadiazoles in the presence of >= 2 equiv of base gave 2-mercaptobenzo[b]thiophenes via an anionic ring-opening/ring-closure pathway.