Synthesis of pyridazothienothiazine and pyrimidothienopyridazines

Article abstract of DOI:10.1080/10426500008045255

3-amino-4,5-diphenylthieno[2,3-c]pyridazine-2-arylcarboxamide 2 underwent cyclization with triethyl orthoformate and with nitrous acid to give the pyrimidothienopyridazines 3a-c, 4b respectively, 3-amino-4,5-diphenylthieno[2,3-c] pyridazine-2-carbohydrazide 6 reacted with aromatic aldehydes to give the corresponding carbohydrazones 7a-c. Compound 7 reacts with triethyl orthoformate, acetic anhydride or with CS₂/pyridine to produce pyrimidothienopyridazines 8,9 and pyridazothienothiazine 11.

Full text of DOI:10.1080/10426500008045255

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Phosphorus, Sulfur, and Silicon
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SYNTHESIS OF
PYRIDAZOTHIENOTHIAZINE AND
PYRIMIDOTHIENOPYRIDAZINES
Sh. M. Radwan a & A. M. Kamal El-Dean a
a Chemistry Department, Faculty of Science, Assiut
University, Assiut, 71516, Egypt
Version of record first published: 27 Oct 2006.
To cite this article: Sh. M. Radwan & A. M. Kamal El-Dean (2000): SYNTHESIS OF
PYRIDAZOTHIENOTHIAZINE AND PYRIMIDOTHIENOPYRIDAZINES, Phosphorus, Sulfur, and
Silicon and the Related Elements, 164:1, 299-313
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