Saponins and C-glycosyl flavones from the seeds of Abrus precatorius

Article abstract of DOI:10.1248/cpb.46.982

Two new saponins, 3-O-[β-D-glucuronopyranosyl-(1 → 2)-β-D- glucopyranosyl]hederagenin (named abrus-saponin I) and 3-O-[β-D- glucuronopyranosyl-(1 → 2)-β-D-glucopyranosyl]oleanolic acid 28-β-D- glucopyranosyl ester (abrus-saponin II), and three new flavones, 6-C-β-D- glucopyranosyl-4',5-dihydroxy-7,8-dimethoxyflavone (precatorin I), 6-C-[β- D-apiofuranosyl-(1 → 2)-β-D-glucopyranosyl)-4',5-dihydroxy-7,8- dimethoxyflavone (precatorin II), 6-C-[β-D-apiofuranosyl-(1 → 2)-β-D- glucopyranosyl]-4',5-dihydroxy-7-methoxyflavone (precatorin III), were isolated from the seeds of Abrus precatorius L. together with twelve known compounds including a naturally new saponin, 3-O-[β-D-glucuronopyranosyl-(1 → 2)-β-D-glucopyranosyl]oleanolic acid. Their structures were determined on the basis of chemical and spectroscopic methods. In addition, the unusual NMR spectral behavior of the flavone C-glycosides is also discussed.

Full text of DOI:10.1248/cpb.46.982

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