The addition of oxygen, in the presence of base, to 4-cycloalkylideneoxazol-5(4H)-ones led to new substituted N-acylcycloalkenecarboxamides in high yield, via base-catalysed isomerisation, oxygenation and subsequent fragmentation of a hydro- or endo-peroxide intermediate.
N. Lalitha, U. T. Bhalerao and D. S. Iyengar, J. Chem. Soc., Perkin Trans. 1, 1993, 737 DOI: 10.1039/P19930000737
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