Diotigenin (I), isolated from the Dioscorea tenuipes complex is deduced to be a 2β,3α,4β-trihydroxy-5β,25L-spirostan. In order to confirm this structure, 2β,3α,4β-trihydroxy-5β,25D-spirostan was synthesised from the naturally occuring yonogenin (III), and was found to be identical with isodiotigenin (II) obtained on isomerisation of (I).
K. Takeda, G. Lukacs and F. Yasuda, J. Chem. Soc. C, 1968, 1041 DOI: 10.1039/J39680001041
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