Photolysis of 3β-acetoxyolean-12-en-28-amide with lead tetra-acetate and iodine gave, albeit in low yield, the corresponding 28,15β-lactone. Further transformations of the latter then afforded primulagenin A (olean-12-ene-3β,16α,28-triol), which can be converted into echinocystic acid (3β,16α-dihydroxyolean-12-en-28-oic acid).
J. Allen, R. B. Boar, J. F. McGhie and D. H. R. Barton, J. Chem. Soc., Perkin Trans. 1, 1972, 2994 DOI: 10.1039/P19720002994
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