Addition reaction of 2-iminocyclopentanedithiocarboxylic acid with Schiff's bases: a novel route to the synthesis of 1,3-thiazine derivatives

Abstract

2-Iminocyclopentanedithiocarboxylic acid (1) reacted with Schiff's bases to give the adduct esters (2). The esters were easily converted into the corresponding thiazines (3a), (3e), and (3f) with accompanying elimination of anilines. In the case of cyclopentylideneanilines, the esters could not be isolated, instead the thiazine (4) was directly obtained.