(24R)-[24-3H]- and (24S)-[24-3H]-cholesterols are transformed into tigogenin [(25R)-5α-spirostan-3β-ol] in Digitalis lanata without involvement of the hydrogen atoms at C-24; this confirms that the reduction of the Δ24-precursor of cholesterol is a ‘trans’ process.
F. Ronchetti and G. Russo, J. Chem. Soc., Perkin Trans. 1, 1976, 1823 DOI: 10.1039/P19760001823
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