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Phosphorus, Sulfur, and Silicon and the Related Elements Volume 179, 2004 - Issue 11
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Original Articles

Pyridazine Derivatives and Related Compounds. Part 11: 1Synthesis of Some Pyrimido[4′,5′:4,5]thieno[2,3-c]pyridazines

Ali Deeb Department of Chemistry, Faculty of Science, Zagazig University, Egypt
,
Mahmoud Kotb
&
Mohamed El-Abbasy
Pages 2245-2252 | Received 01 Nov 2003, Accepted 01 Apr 2004, Published online: 16 Aug 2010
 
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Abstract

3-Substituted pyrimido[4′,5′:4,5]thieno[2,3-c]pyridazine-2,4-di-ones and 3-amino-2-methylpyrimido[4′,5′:4,5]thieno[2,3-c]pyridazine-4-ones were synthesized starting from ethyl 5-aminothieno[2,3-c] pyridazine-6-carboxylate 1. Reaction of amino ester 1with phenyl isothiocyanate affords thiourea derivative 10which undergo further transformation to the related fused heterocyclic systems.

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