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Int. J. Mol. Sci. 2012, 13(2), 2263-2275; doi:10.3390/ijms13022263
Article

Comprehensive and Facile Synthesis of Some Functionalized Bis-Heterocyclic Compounds Containing a Thieno[2,3-b]thiophene Motif

* , * ,
 and
Department of Chemistry, Faculty of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
* Authors to whom correspondence should be addressed.
Received: 6 January 2012 / Revised: 9 February 2012 / Accepted: 13 February 2012 / Published: 20 February 2012
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Abstract

A comprehensive and facile method for the synthesis of new functionalized bis-heterocyclic compounds containing a thieno[2,3-b]thiophene motif is described. The hitherto unknown bis-pyrazolothieno[2,3-b]thiophene derivatives 2ac, bis-pyridazin othieno[2,3-b]thiophene derivatives 4, bis-pyridinothieno[2,3-b]thiophene derivatives 6a,b, and to an analogous bis-pyridinothieno[2,3-b]thiophene nitrile derivatives 7 are obtained. Additionally, the novel bis-pyradazinonothieno[2,3-b]thiophene derivatives 9, and nicotinic acid derivatives 10, 11 are obtained via bis-dienamide 8. The structures of all newly synthesized compounds have been elucidated by 1H, 13C NMR, GCMS, and IR spectrometry. These compounds represent a new class of sulfur and Nitrogen containing heterocycles that should also be of interest as new materials.
Keywords: pyrazole; nicotinic acid; thieno[2,3-b]thiophene; enaminone; heterocycle pyrazole; nicotinic acid; thieno[2,3-b]thiophene; enaminone; heterocycle
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Mabkhot, Y.N.; Barakat, A.; Al-Majid, A.M.; Alshahrani, S.A. Comprehensive and Facile Synthesis of Some Functionalized Bis-Heterocyclic Compounds Containing a Thieno[2,3-b]thiophene Motif. Int. J. Mol. Sci. 2012, 13, 2263-2275.

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