The methoxy-ketone (7), derived from Westphalen's diol, was degraded to 8α-benzoyloxymethyl-des-AB-cholestan-9-one (10), from which the title compound (6) was obtained in a yield of 47% based on the ketone (7), or 22.5% overall from cholesterol. The allylic alcohol (6) thus becomes relatively easily accessible.
P. J. Kocienski, B. Lythgoe and D. A. Roberts, J. Chem. Soc., Perkin Trans. 1, 1980, 897 DOI: 10.1039/P19800000897
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