Journal
TETRAHEDRON
Volume 68, Issue 32, Pages 6485-6491Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tet.2012.05.110
Keywords
Selenium dioxide; Aromatization; 4 beta,7 alpha-Dihydroxy steroids; Dehydrogenation; Natural products
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Funding
- UGC (New Delhi)
- CSIR (New Delhi)
- Ministry of Higher Education (Malaysia) [UM.C/HIR/MOHE/SC/12]
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Selenium dioxide oxidation of cholesterol reveals a solvent-dependent product selectivity and facile one-pot synthesis of three derivatives, including aromatic analogues of naturally occurring ergosterol. Efficient access to 4 beta,7 alpha-dihydroxy cholesterol is described. Analogous chemistry of p-sitosterol and diosgenin is also reported. The protocol is found effective to synthesize two diaromatic ergosterol natural products. A brief description of the molecular structures of the representative diaromatic cholesterol derivative and the triacetylated 4 beta,7 alpha-dihydroxy cholesterol derivative are proven by X-ray crystallography. (C) 2012 Elsevier Ltd. All rights reserved.
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