Intramolecular 4+2 cycloaddition of thieno[2,3-e][1,2,4]triazines: routes towards condensed thieno[2,3-b]pyridines |
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| Authors: | Yehia A Ibrahim Balkis Al-SalehAtta Allah A Mahmoud |
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| Affiliation: | Department of Chemistry, Faculty of Science, Kuwait University, P.O. Box 5969, Safat 13060, Kuwait |
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| Abstract: | Synthetic approaches towards new condensed thienopyridine ring systems including furo[2,3-b]thieno[3,2-e]pyridines, bisthieno[2,3-b:3′,2′-e]pyridines, 5H-chromeno[2,3-b]thieno[3,2-e]pyridines, 5H-benzo(f)chromeno[2,3-b]thieno[3,2-e]pyridines have been achieved by application of intramolecular 4+2 cycloaddition reactions of suitably designed thieno[2,3-e][1,2,4]triazines tethered with alkene or alkyne terminals. |
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| Keywords: | 1,2,4-triazines thieno[2,3-e][1,2,4]triazines 2,3-dihydrofuro[2,3-b]thieno[3,2-e]pyridines bisthieno[2,3-b:3&prime ,2&prime -e]pyridines 5H-chromeno[2,3-b]thieno[3,2-e]pyridines 5H-benzo(f)chromeno[2,3-b]thieno[3,2-e]pyridines |
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