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Synthesis of new heteroaromatic nitrogen ligands: Pyrimido-[4″,5″:4′,5′]-thieno[3′,2′:4,5]thieno[3,2-d]pyrimidines and 1,2,3-triazine[4″,5″:4′,5′]thieno[3′,2′:4,5]thieno[3,2-d]-1,2,3-triazines

✍ Scribed by Gerardo Blanco; José M. Quintela; Carlos Peinador

Publisher: Journal of Heterocyclic Chemistry
Year: 2006
Tongue: English
Weight: 126 KB
Volume: 43
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570430435

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✦ Synopsis

Abstract

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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.

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