Irradiation of a dioxan solution of α- or β-amyrenonyl acetate affords 11,25-cyclo-11α-hydroxy-α- or -β-amyrin acetate, respectively. Oxidation of the 11,25-cyclo-11α-ols with lead tetra-acetate yields 25-hydroxy-α- or-β-amyrenonyl acetate, while acid-catalysed cleavage of the photoproducts gives the corresponding 11-methyl-25-nor-5(10),11,13(18)-triene.
B. W. Finucane and J. B. Thomson, J. Chem. Soc. C, 1971, 1569 DOI: 10.1039/J39710001569
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