SCHEDULED MAINTENANCE
8α-Phenylsulphonyl-des-AB-ergostane (16), prepared from des-AB-ergost-8-ene, formed a lithium derivative which reacted with the benzoyloxy-aldehyde (8) to give, after treatment with trimethylchlorosilane, a mixture of β-silyloxy-sulphones. Reduction with lithium amalgam, followed by removal of the benzoyl group, gave vitamin D4(2).
P. J. Kocienski, B. Lythgoe and S. Ruston, J. Chem. Soc., Perkin Trans. 1, 1979, 1290 DOI: 10.1039/P19790001290
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