Article ID Journal Published Year Pages File Type
2028412 Steroids 2012 10 Pages PDF
Abstract

Treatment of steroid sapogenins with benzaldehyde and BF3·Et2O cleanly produces E-23(23′)-benzylidenspirostanes in good yields in a reaction pathway which consists on an aldol reaction followed by a dehydration step. The obtained E-23(23′)-benzylidenspirostanes can be easily converted to dinorcholanic lactones by treatment with CrO3 in acetic acid. The synthetic sequence to dinorcholanic lactones is compatible with the presence of double bonds and carbonyl groups in the steroid framework.

Graphical abstractFigure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Reaction of spirostanes with benzaldehyde produces E-23(23′)-benzylidenspirostanes. ► The reaction pathway consists of an aldol reaction followed by a dehydration step. ► Benzylidenspirostanes are oxidized to dinorcholanic lactones with CrO3 in acetic. ► X-ray studies of the obtained compounds confirmed the proposed structures.

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Life Sciences Biochemistry, Genetics and Molecular Biology Biochemistry
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