SCHEDULED MAINTENANCE:
U.v. irradiation of 3β-acetoxy-5α-lanost-24-en-11β-yl nitrite in the presence of oxygen affords 3β-acetoxy-11β-hydroxy-5α-lanost-24-en-19-yl nitrate. Further standard steps then give 3β-acetoxy-5α-lanosta-9(11),24-dien-19-yl methanesulphonate, which is reduced by lithium aluminium hydride in refluxing diethyl ether to afford cycloartenol in good overall yield.
R. B. Boar and D. B. Copsey, J. Chem. Soc., Perkin Trans. 1, 1979, 563 DOI: 10.1039/P19790000563
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