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  • Title: Pregnane glycosides, gymnepregosides A-F from the roots of Gymnema alternifolium.
    Author: Yoshikawa K, Matsuchika K, Arihara S, Chang HC, Wang JD.
    Journal: Chem Pharm Bull (Tokyo); 1998 Aug; 46(8):1239-43. PubMed ID: 9734311.
    Abstract:
    The structural elucidation of six new related polyoxypregnane glycosides, gymnepregosides A (1), B (2), C (3), D (4), E (5) and F (6), together with two known compounds, from the roots of Gymnema alternifolium (Asclepiadaceae) was achieved through on a detailed study of 1H- and 13C-NMR spectral data and chemical means. The results obtained for new compounds, 1-6, show that they are (20S)-pregn-6-ene-3 beta,5 alpha,8 beta,12 beta,14 beta,17 beta,20-heptaol or sarcostin 3-O-glycosides, and all the sugars at C-3 are beta(1-->4)-linked. Some of them possessed benzoyl, cinnamoyl and tigloyl residues as the ester linkages located at C-12 and/or C-20 of the aglycon.
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