The First Syntheses of Multiply Hydroxylated 16,17-Ene-Sterols Possessing the Androst-16-ene-3β,5α-diol Motif

Charles M. Marson; Alphonso S. Rioja; Kelvin E. Smith; John M. Behan

doi:10.1055/s-2003-37656

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The First Syntheses of Multiply Hydroxylated 16,17-Ene-Sterols Possessing the Androst-16-ene-3β,5α-diol Motif

Charles M. Marson*^a, Alphonso S. Rioja^a, Kelvin E. Smith^b, John M. Behan^c
^a Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, UK
Fax: 44(020)76797463; e-Mail: c.m.marson@ucl.ac.uk;
^b Department of Biological Sciences, Queen Mary College, Mile End Road, London E1 4NS, UK
^c Quest International, Ashford, Kent TN24 0LT, UK

Abstract

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Abstract

5α-Androst-16-ene-3β,5α-diol (12) and 5α-androst-16-ene-3β,5α,6β-triol (16) have been synthesised from dehydroepiandrosterone. Ketalisation and O-silylation of dehydroepiandrosterone enabled the 5α,6α-epoxide 7 to be obtained; reductive cleavage with LiAlH₄ and deprotection afforded 3β,5α-dihydroxy-5α-androstan-17-one (9) whose hydrazone was converted into the 15,16-dehydro-16-iodo sterol 11 prior to hydrodeiodination with sodium in ethanol to give 5α-androst-16-ene-3β,5α-diol (12). Reaction of dehydroepiandrosterone with N-bromosuccinimide gave the 3β,5α,6β-ketotriol 13 which by the above three-step sequence of hydrazone formation, conversion into the vinylic iodide and reduction afforded 5α-androst-16-ene-3β,5α,6β-triol 16.

Key words

steroids - iodine - hydrazones - reductions - epoxidations

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References

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