Abstract
1-(Benzothiazol-2-yl)-3-(N,N-dimethylamino)-2-(phenylsulfonyl)prop-2-en-1-one (3) and 1-(1-methylbenzimidazol-2-yl)-3-(N,N-dimethylamino)-2-(phenylsulfonyl)prop-2-en-1-one (4) were obtained from the reaction of 1-(benzothiazothiazol-2-yl)-2-phenylsulfonyl-1-ethanone (1) and 1-(1-methyl-1H-benzimidazol-2-yl)-2-(phenylsulfonyl)-1-ethanone (2) with N,N-dimethylformamide dimethyl acetal, respectively. The enaminosulfones 3 and 4 were used as versatile building blocks for the synthesis of novel pyrazolo[1,5-a]pyrimidine and [1,2,4]-triazolo[1,5-a]pyramidine derivatives via their reactions with the appropriate aminopyrazoles and aminotriazole under both microwave and thermal reaction conditions. They have been also utilized as reactive synthons for the construction of novel pyrimido[1,2-a]benzimidazole, pyrido[1,2-a]benzimidazole, pyrimidine, isoxazole and pyrazole heterocycles pendent to benzothiazole and benzimidazole ring systems.
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Acknowledgments
A. F. Darweesh is very thankful to Prof. Peter Metz [Technische Universität (TU)-Dresden] for giving him the chance to carry out spectral analysis at his laboratory during the Alexander von Humboldt fellowships: July 2012–July 2014. He also is deeply thankful to the Alexander von Humboldt Foundation (AvH) for granting him fellowships from July 2012–July 2014 at TU-Dresden. Amani A. Salman is very thankful to Prof. Kamal M. Dawood (Cairo University) for giving her the facilities for carrying out microwave experiments.
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Darweesh, A.F., Mekky, A.E.M., Salman, A.A. et al. Efficient, microwave-mediated synthesis of benzothiazole- and benzimidazole-based heterocycles. Res Chem Intermed 42, 4341–4358 (2016). https://doi.org/10.1007/s11164-015-2279-8
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DOI: https://doi.org/10.1007/s11164-015-2279-8