Pyridazines; XXX. A Novel Approach to Pyridopyridazines by Annelation of the Pyridine Ring to the 1,2-Diazine System

Article abstract of DOI:10.1055/s-1986-31809

Procedures for high-yield syntheses of 2-ethoxy- and 2-dimethylamino-4-arylpyrido<2,3-d>pyridazines (3a, b, 5), 3-alkyl- and 1-alkyl-4-aryl-1,2-dihydro-2-oxopyrido<2,3-d>pyridazines (4b, 6) as well as ethyl 4-aryl-1,2-dihydro-2-oxopyrido<2,3-d>pyridazine-