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Issue 0, 1971
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The significant directing effect of the cyano-group in the reduction of 5-cyano-3-oxo-steroids with complex metal hydrides

Abstract

The stereochemistry of reduction of 5α- and 5β-cyano-17β-hydroxyandrostan-3-one [(la) and (Va)] and of 5α- and 5β-cyano-17β-hydroxyoestran-3-one [(lb) and (Vb)] with lithium tri-t-butoxyaluminium hydride and sodium borohydride has been investigated. Several earlier stereochemical assignments for the resulting 5-cyano-3α- and 3β-alcohols proved incorrect. In almost every case, formation of the axial alcohol is predominant, this predominance being greater with lithium tri-t-butoxyaluminium hydride in tetrahydrofuran than with sodium borohydride in ethanol. This significant directing effect of the 5-cyano-group is conspicuous and can be accounted for in terms of both steric and polar factors.

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Article information


J. Chem. Soc. C, 1971, 2415-2420
Article type
Paper

The significant directing effect of the cyano-group in the reduction of 5-cyano-3-oxo-steroids with complex metal hydrides

W. Nagata, T. Wakabayashi, M. Narisada and Y. Hayase, J. Chem. Soc. C, 1971, 2415
DOI: 10.1039/J39710002415

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