Diphenylcyclopropenone and isoxazoles, on heating, give 4-pyridones by a reaction which involves loss of the isoxazole 5-substituent in 4,5-disubstituted isoxazoles and its retention, as a 3-acyl substituent of the pyridone, in the 4-unsubstituted isoxazole case.
R. Grigg, R. Hayes, J. L. Jackson and T. J. King, J. Chem. Soc., Chem. Commun., 1973, 349 DOI: 10.1039/C39730000349
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