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Abstract
5α-Cholest-8(14)-en-15-one (III) has been isolated as a by-product of an improved synthesis of 5α-cholest-8(14)-en-7-one (II); the previously undescribed n.m.r. and mass spectra of the former compound are discussed since they are of theoretical interest and diagnostic importance. Whereas reduction of steroidal Δ8(14)15-ketones by metal–ammonia has been known for some time to produce saturated ketones of natural stereochemistry, the corresponding reaction of the isomeric Δ8(14)-7-ketone system has now been shown unexpectedly to generate a ketone of unnatural configuration, and so constitutes a novel and simple synthesis of 14β-steroids.
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