13C nuclear magnetic resonance spectra of 23-hydroxy spirostane sapogenins of Solanum hispidum
- 1 May 1981
- journal article
- research article
- Published by Canadian Science Publishing in Canadian Journal of Chemistry
- Vol. 59 (9) , 1328-1330
- https://doi.org/10.1139/v81-195
Abstract
The 13C nmr spectra of some 23-hydroxy spirostane sapogenins from Solanum hispidum Pers., mostly as their acetates, have been studied. The effect of different orientations of the substituents at C-23 and C-25 as well as that due to change in the stereochemistry at C-22 have been discussed. The unexpected absence of the γg effect of the axial 23-OH on C-25 in hispigenin (5), a 22βO-spirostane derivative, presumably results from ring F deformation brought about by the steric interaction between 20-Me and 23-OH groups.Keywords
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