Pyridazine Derivatives and Related Compounds. Part 11: <sup>1</sup>Synthesis of Some Pyrimido[4′,5′:4,5]thieno[2,3-<i>c</i>]pyridazines
作者:Ali Deeb、Mahmoud Kotb、Mohamed El-Abbasy
DOI:10.1080/10426500490475175
日期:2004.11.1
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.