Reactions of Dimethyl Ethynedicarboxylate with (Substituted Ethylidene)hydrazinecarbothioamides

Abstract

The reaction of (substituted ethylidene)hydrazinecarbothioamides 4a, 4b, 4c, 4d, 4e, 4f, 4g with dimethyl ethynedicarboxylate (DMAD, 2) gave [(substituted ethylidene)hydrazono)-4-oxothiazolidine-5-ylidene]acetates 7a, 7b, 7c, 7d, 7e, 7f, 7g (71–88 %). The structure of the new compounds was established by infrared spectroscopy, mass spectrometry, and NMR spectroscopy.