Asymmetric reduction of steroidal 25-en-24-ones by a complex of LiAlH4 and 2,2′-dihydroxy-1,1′-binaphthyl led to a steroselective introduction of hydroxy-groups into the 24-, 25-, and 26-positions of the cholesterol side chain.
M. Ishiguro, N. Koizumi, M. Yasuda and N. Ikekawa, J. Chem. Soc., Chem. Commun., 1981, 115 DOI: 10.1039/C39810000115
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