Antisweet Natural Products. V. Structures of Gymnemic Acids VIII-XII from Gymnema sylvestre R. BR.

Kazuko YOSHIKAWA; Miki NAKAGAWA; Ryouko YAMAMOTO; Shigenobu ARIHARA; Kouji MATSUURA

doi:10.1248/cpb.40.1779

Kazuko YOSHIKAWA, Miki NAKAGAWA, Ryouko YAMAMOTO, Shigenobu ARIHARA, Kouji MATSUURA

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Keywords: Gymnema sylvestre, Asclepiadaceae, antisweet substance, oleanane, acylsaponin, gymnemic acid, gymnemagenin, tiglic acid, 2-methylbutyric acid, acetic acid

JOURNAL FREE ACCESS

1992 Volume 40 Issue 7 Pages 1779-1782

DOI https://doi.org/10.1248/cpb.40.1779

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Abstract

Five oleanane-type triterpenoid saponins, gymnemic acids VIII-XII as antisweet principles were isolated from the leaves of Gymnema sylvestre (Asclepiadaceae). Their structures were established on the basis of spectral and chemical evidence. They were characterized as glucosideuronic acid derivatives of gymnemagenin acylated with acetyl, tigloyl and/or 2-methylbutyroyl moieties.

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