Reactions of 1,3-benzodithiole-2-thione and ethylene trithiocarbonate with benzyne generated from 2-carboxybenzenediazonium chloride: preparation of novel bicyclic sulfonium salts by trapping 1,3-dipolar cycloaddition intermediates

Abstract

The reaction of benzyne, generated from 2-carboxybenzenediazonium chloride 4, with 1,3-benzodithiole-2-thione.gives the novel bicyclic sulfonium chloride 7 by trapping of the 1,3-dipolar cycloaddition intermediate 6 with hydrogen chloride which when treated with ethylene trithiocarbonate affords 7 in one-pot in good yields.