Phosphorus, Sulfur and Silicon and the Related Elements p. 299 - 313 (2000)
Update date:2022-07-30
Topics:
Radwan
Kamal El-Dean
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.
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