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Triterpenoid saponins and acylated prosapogenins from Harpullia austro-caledonica

Abstract : Three new triterpenoid saponins have been isolated from the stem bark of Harpullia austro-caledonica and identified as 24-O-[alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranosyl]-28-O-[beta-D-glucopyranosyl-(1->2)-beta-D-glucopyranosyl]-protoaescigenin, 24-O-[alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranosyl]-28-O-[beta-D-glucopyranosyl-(1->2)-beta-D-glucopyranosyl]-16-desoxyprotoaescigenin, 24-O-[alpha-L-rhamnopyranosyl-(1->2)-beta-D-glucopyranosyl]-28-O-[beta-D-glucopyranosyl-(1->2)-beta-D-glucopyranosyl]-24-oxo-camelliagenin D. The 21,22-di-O-angeloate esters of protoaescigenin and barringtogenol C were isolated in the acid hydrolysate of the saponin extract together with a new prosapogenin identified as 21beta,22alpha-di-O-angeloyl camelliagenin D. The structures were established using one- and two- dimensional NMR and mass spectrometry.
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Laurence Voutquenne, Cécile Kokougan, Catherine Lavaud, Isabelle Pouny, Marc Litaudon. Triterpenoid saponins and acylated prosapogenins from Harpullia austro-caledonica. Phytochemistry, Elsevier, 2002, 59 (8), pp.825-832. ⟨10.1016/s0031-9422(01)00482-4⟩. ⟨hal-01996972⟩

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