Isoxazol-5-ones undergo ring-enlargement by reaction with nitrile oxides to give 1,3-oxazin-6-ones. The mechanism is discussed. Some chemical transformations of the oxazinone ring are described.
F. Risitano, G. Grassi, F. Foti, F. Caruso and G. Lo Vecchio, J. Chem. Soc., Perkin Trans. 1, 1979, 1522 DOI: 10.1039/P19790001522
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