Efficient and Facile Synthesis of Substituted Aminothiadiazolylhydrazonoindolin-2-ones
作者:Alaa A. Hassan、Fathy F. Abdel-Latif、Mohamed Abdel-Aziz、Sara M. Mostafa、Stefan Bräse、Martin Nieger
DOI:10.1002/jhet.2336
日期:2016.3
New series of substituted aminothiadiazolylhydrazonoindolin‐2‐ones were prepared in high yields (89–94%) via the cyclocondensation of thiocarbonohydrazides (1a, 1b, 1c, 1d) with 3‐(dicyanomethylene)‐2‐indolone in (ethanol/piperidine) at room temperature. Explanations of these conversations involve the nucleophilic addition on the dicyanomethylene carbon atom. The structures were established by spectroscopic
Heterocyclization of thiocarbonohydrazides: Facile synthesis of 5-unsubstituted-1,3,4-thiadiazoles
作者:Alaa A. Hassan、Fathy F. Abdel-Latif、Mohamed Abdel Aziz、Sara M. Mostafa、Stefan Bräse、Martin Nieger
DOI:10.1016/j.cclet.2015.05.034
日期:2015.9
2-(Hydrazinecarbothioyl)-N-substituted hydrazinecarbothioamides react with 2,3,5,6-tetrachloro-1,4-benzoquinone in high yields in a novel fast and facile method to give 5-unsubstituted-1,3,4-thiadiazole-2-amine derivatives. The synthesized compounds were characterized by spectroscopic methods and confirmed by using X-ray crystallography. A rationale for the formation of the products is presented. (C) 2015 Chinese Chemical Society and Institute of Materia Medica, Chinese Academy of Medical Sciences. Published by Elsevier B.V. All rights reserved.
Tetracyanoethylene as a mediator and building block in synthesis of 5-substituted amino-1,3,4-thiadiazolyl-1H-pyrazole derivatives
作者:Alaa A. Hassan、Shaaban K. Mohamed、Fathy F. Abdel-Latif、Sara M. Mostafa、Joel T. Mague、Mehmet Akkurt、Mohamed Abdel-Aziz
DOI:10.1016/j.tetlet.2015.12.023
日期:2016.1
The conversion of thiocarbonohydrazides to 5-substituted amino-1,3,4-thiadiazolyl-1H-pyrazoles in one-step was achieved via the reaction with tetracyanoethylene (TCNE). In this conversion, TCNE is used as a mediator and/or a building block. The product was conclusively confirmed by spectroscopic data and single crystal X-ray structural analysis. (C) 2015 Elsevier Ltd. All rights reserved.
A Novel Method for the Synthesis of Furo-imidazo[3.3.3]propellanes from Thiocarbonohydrazides
Novel furo-imidazo[3.3.3]propellanes are synthesized via reactions of thiocarbonohydrazides with (1,3-dioxo-2,3-dihydro-1H-inden-2-ylidene)propanedinitrile in tetrahydrofuran. A rationale for these conversions involving nucleophilic addition on the dicyanomethylene carbon atom is presented. The structures of these unexpected products are confirmed by using IR, NMR, mass spectrometry and single-crystal X-ray diffraction.