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Antisweet natural products. IX. Structures of gymnemic acids XV-XVIII from Gymnema sylvestre R. Br. V


Antisweet natural products. IX. Structures of gymnemic acids XV-XVIII from Gymnema sylvestre R. Br. V



Chemical and Pharmaceutical Bulletin 41(10): 1730-1732



ISSN/ISBN: 0009-2363

DOI: 10.1248/cpb.41.1730

Systematic separation of the saponin fraction of the leaves of Gymnema sylvestre has led to the isolation of four new saponins, gymnemic acids XV-XVIII, as antisweet substances. The structures were elucidated by spectral and chemical studies. Gymnemic acids XV-XVIII, are 21-O-2-methylbutyryl-22-O-2-methylcrotonoyl, 16,22-O-bis-2-methylcrotonoyl, 21-O-benzoyl, and 28-O-benzoyl gymnemagenin 3-O-gluculonides, respectively. Gymnemic acids VIII and IX that we had named in the previous paper were renamed gymnemic acids XV and XVI, respectively.

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Accession: 002565498

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