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Glandulosides A-D, triterpene saponins from Acanthophyllum glandulosum
Ghezala Gaidi1, Tomofumi Miyamoto, Mohammad Ramezani
1Laboratoire de Pharmacognosie, Unité de Molécules d'Intérêt Biologique (UMIB), EA 3660, Faculté de Pharmacie, Université de Bourgogne, 7, Boulevard Jeanne d'Arc, BP 87900, 21079 Dijon Cedex, France.
Abstract:
Four novel triterpenoid saponins, glandulosides A (1), B (2), C (3), and D (4), together with two known saponins (5 and 6) have been isolated from the roots of Acanthophyllum glandulosum. Their structures were elucidated using a combination of homo- and heteronuclear 2D NMR techniques (COSY, TOCSY, NOESY, HSQC, and HMBC) and by FABMS. The new compounds were characterized as 23-O-beta-D-galactopyranosylgypsogenic acid-28-O-beta-D-glucopyranosyl-(1-->3)-[beta-d-galactopyranosyl-(1-->6)]-beta-D-galactopyranoside (1), 3-O-beta-D-galactopyranosyl-(1-->2)-[beta-D-xylopyranosyl-(1-->3)]-beta-D-glucuronopyranosylgypsogenin-28-O-beta-D-xylopyranosyl-(1-->3)-beta-D-xylopyranosyl-(1-->4)-alpha-l-rhamnopyranosyl-(1-->2)-3-O-acetyl-beta-D-fucopyranoside (2), 3-O-beta-D-galactopyranosyl-(1-->2)-[beta-D-xylopyranosyl-(1-->3)]-beta-D-glucuronopyranosylgypsogenin-28-O-beta-D-xylopyranosyl-(1-->3)-beta-D-xylopyranosyl-(1-->4)-alpha-L-rhamnopyranosyl-(1-->2)-3,4-di-O-acetyl-beta-D-fucopyranoside (3), and 3-O-beta-D-galactopyranosyl-(1-->2)-[beta-D-xylopyranosyl-(1-->3)]-beta-D-glucuronopyranosylgypsogenin-28-O-beta-D-xylopyranosyl-(1-->3)-beta-D-xylopyranosyl-(1-->4)-alpha-l-rhamnopyranosyl-(1-->2)-[3-O-acetyl-beta-D-quinovopyranosyl-(1-->4)]-beta-D-fucopyranoside (4).
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