Treatment of lanosta-2,8-diene-1,7,11-trione with zinc dust in boiling acetic acid affords the 8b,9a- and 8a,9b-isomers of lanost-2-ene-1,7,11-trione. Treatment of 1,7,11-trioxolanost-8-en-3b-yl acetate with zinc and acetic acid yields 8b,9a-lanost-2-ene-1,7,11-trione and the 3-epimers of 1,7,11-trioxo-8b,9a-lanostan-3-yl acetate. Epimerisation of the 3-acetate also occurs in the presence of acetyl chloride.
J. Scotney and E. V. Truter, J. Chem. Soc. C, 1969, 1079 DOI: 10.1039/J39690001079
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