Conventional and microwave irradiation assisted synthesis of new 1,2,4‐triazepine‐3‐thiones
作者:Ashraf A. Aly、Alaa A Hassan、Essmat M. El‐Sheref、Mamdouh A. Mohamed、Alan B. Brown
DOI:10.1002/jhet.5570450234
日期:2008.3
New 1,2,4-triazepine-3-thiones have been obtained during the respective reactions of N-substituted-hydrazino carbothioamides with dimethyl acetylenedicarboxylate and dibenzoyl acetylene under prolonged reflux in acetic acid and/or DMF. However, the reaction of the starting materials in DMF under microwaveirradiation afforded the same products in higher yields within a few minutes.
The Reactivity of Dimethyl Acetylenedicarboxylate and Heterocyclization of Hydrazinecarbothioamides to 1,3-Thiazolidin-4-ones
作者:Alaa A. Hassan、Nasr K. Mohamed、Kamal M. A. El-Shaieb、Hendawy N. Tawfeek、Stefan Bräse、Martin Nieger
DOI:10.1002/jhet.2392
日期:2016.1
2‐Substituted hydrazinecarbothioamides and N,2‐disubstituted hydrazinecarbothioamides react, in high yields with dimethylacetylenedicarboxylate to give 4‐oxo‐Z‐(thiazolidin‐5‐ylidene)acetate derivatives. Several mechanistic options involving interaction are presented. The structures of thiazolidin‐4‐ones have been unambiguously confirmed by single crystal X‐ray crystallography.