Oxidation of hydroxamic acids in the presence of 2,5-dimethylfuran gives excellent yields of the 3-substituted-5-methyl-5-(cis-3-oxobutenyl)-1,4,2-dioxazoles (2); the reaction is reversible and probably occurs by way of an initially formed Diels–Alder adduct.
C. J. B. Dobbin, D. Mackay, M. R. Penney and L. H. Dao, J. Chem. Soc., Chem. Commun., 1977, 703 DOI: 10.1039/C39770000703
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