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Acylated Preatroxigenin Glycosides from Atroxima congolana

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journal contribution
posted on 15.08.2003, 00:00 by Mohamed Elbandy, Tomofumi Miyamoto, Clément Delaude, Marie-Aleth Lacaille-Dubois
Six new acylated bisdesmosidic preatroxigenin saponins named atroximasaponins E1, E2 (1, 2), F1, F2 (3, 4), and G1, G2 (5, 6) were isolated as three inseparable mixtures of the trans- and cis-p-methoxycinnamoyl derivatives, from the roots of Atroxima congolana. Their structures were established through extensive NMR spectroscopic analysis as 3-O-β-d-glucopyranosylpreatroxigenin-28-O-β-d-xylopyranosyl-(1→4)-α-l-rhamnopyranosyl-(1→2)-[β-d-glucopyranosyl-(1→3)]-[4-O-trans-p-methoxycinnamoyl]-β-d-fucopyranoside (atroximasaponin E1, 1), and its cis-isomer, atroximasaponin E2 (2), 3-O-β-d-glucopyranosylpreatroxigenin-28-O-β-d-xylopyranosyl-(1→4)-α-l-rhamnopyranosyl-(1→2)-[6-O-acetyl-β-d-glucopyranosyl-(1→3)]-[4-O-trans-p-methoxycinnamoyl]-β-d-fucopyranoside (atroximasaponin F1, 3), and its cis-isomer, atroximasaponin F2 (4), 3-O-β-d-glucopyranosylpreatroxigenin-28-O-β-d-apiofuranosyl-(1→3)-[α-l-rhamnopyranosyl-(1→2)]-[4-O-trans-p-methoxycinnamoyl]-β-d-fucopyranoside (atroximasaponin G1, 5), and its cis-isomer, atroximasaponin G2 (6), respectively.

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