Efficient Methods for the Synthesis of Novel Arylazothiazoles Based on Acetylferrocene or Adamantane

Author(s): Abdelwahed R. Sayed*, Mohamed S.M. Ahmed, Sobhi M. Gomha

Journal Name: Current Organic Synthesis

Volume 17 , Issue 4 , 2020

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Graphical Abstract:


Background: Hydrazonoyl halides are convenient for the synthesis of arylazothiazoles.

Materials and Methods: A series of novel arylazothiazoles were efficiently synthesized from the reaction of hydrazonoyl chlorides with 2-(adamantan-2-ylidene)hydrazinecarbothioamide or 2-(ferrocenyl-1-ylidene)hydrazinecarbo-- thioamide in dioxane used as an aprotic solvent because of its lower toxicity and higher boiling point (101 °C) and triethylamine at reflux. The reaction mechanistic pathway proceeded by the nucleophilic substitution reaction by the elimination of hydrogen chloride to give thiohydrazonates as intermediate, which in situ undergo intramolecular cyclization and loss of water molecule to afford the final product of novel arylazothiazoles. This method is simple with good yield and excellent purities.

Results and Discussion: The synthetic schemes for the final products are proposed and discussed. The chemical structures of the final products were identified by different techniques, such as elemental analysis, Fourier-transform infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), and mass spectrometry (MS).

Conclusion: In this article, we prepared arylazothiazoles from the reaction of 2-(adamantan-2-ylidene)hydrazinecarbothioamide or 2-(ferrocenyl-1-ylidene)hydrazinecarbothioamide with hydrazonoyl halides.

Keywords: Hydrazonoyl, thiazoles, hydrazone, thioamide, mass spectrometry, elemental analysis.

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Year: 2020
Page: [282 - 287]
Pages: 6
DOI: 10.2174/1570179417666200226091711
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