Gerardo Blanco, J. Quintela, C. Peinador
Jul 1, 2006
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Influential Citations
7
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Journal
Journal of Heterocyclic Chemistry
Abstract
An efficient one-pot access for the synthesis of the previously unreported tetracyclic fused pyrimido-[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2-d]pyrimidine (3) and 1,2,3-triazine[4″,5″:4′,5′]thieno-[3′,2′:4,5]thieno-[3,2-d]-1,2,3-triazine (5) heteroaromatic nitrogen ligands is described. The title compounds 3 and 5 were obtained from 3,4-diaminothieno[2,3-b]thiophene-2,5-dicarbonitrile and phosgeniminium chloride and sodium nitrite/HCl, respectively. Substituted condensed thieno[2,3-b]thiophene derivatives 4 and 6 were synthesized by nucleophilic displacement of the chloroderivatives 3 and 5.