Toxic constituents of the asclepiadaceae. Structure elucidation of sarcovimiside A-C, pregnane glycosides of Sarcostemma viminale
- 1 January 1993
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 1
- No. 4,p. 483-487
- https://doi.org/10.1039/p19930000483
Abstract
The structure elucidation of three related pregnane glycosides, sarcovimiside A, B, and C from Sarcostemma viminale, is based on a detailed study of their highfield 1H and 13C NMR spectra. The results show that all the sugars are (1 → 4)-linked and both (β-D- and α-L-cymarose residues are present in each glycoside chain. The aglycone of sarcovimiside A was identified as 12β-benzoyloxy-3β,8β,14.17-tetrahydroxy-14β,17α-pregn-5-en-20-one whereas in the case of both sarcovimiside B and C, oxidative cleavage of the C(8)–C(14) bond occurred and the aglycone is the 12,20-O,O-dibenzoyl derivative of (20S)-3β,5,12β3,17,20-pentahydroxy-8,14-seco-5β,17α-pregn-6-ene-8,14-dione. Sarcovimiside C is the β-(1→4)-glucopyranosyl derivative of sarcovimiside B.Keywords
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