Paryzek Z. Tetracyclic triterpenes. XII. Reduction of 7-carbonyl group in 4,4,14 alpha-trimethyl-5 alpha-cholestane with unnatural 9 beta-configuration.
Steroids 1988;
52:173-80. [PMID:
3254621 DOI:
10.1016/0039-128x(88)90001-3]
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Abstract
The carbonyl group in 3 beta-acetoxy-9 beta, 11 beta-epoxy-5 alpha-lanostan-7-one (1) was found resistant to reductions with conventional mild reducing agents. Reduction with LiAlH4 proceeded with unusual stereochemistry reflecting the steric crowding of the 7-carbonyl group in the folded conformation of the substrate possessing the unnatural 9 beta-configuration.
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