The title compound 4 was quantitatively converted into the isomeric furan derivative 5 under relatively mild acidic conditions; when compound 4 was treated with 3-chloroperbenzoic acid in dichloromethane and sodium hypochlorite in aqueous dioxane, compounds 9 and 11, respectively, were obtained. Both compounds were isolated in 48% yield.
B. V. Joshi and C. B. Reese, J. Chem. Soc., Perkin Trans. 1, 1992, 441 DOI: 10.1039/P19920000441
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