Pyridine N-imide (1a) reacts with methylphenylcyclopropenone (2) in methanol to give a β-aminoester (3) and the first reported 3H-pyrido[1,2-b]pyridazin-3-one (4); reaction in dichloromethane permitted isolation of the intermediate (5a).
A. Kascheres and D. Marchi, J. Chem. Soc., Chem. Commun., 1976, 275a DOI: 10.1039/C3976000275A
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