Tannins of Cornaceous Plants. I. Cornusiins A, B and C, Dimeric Monomeric and Trimeric Hydrolyzable Tannins from Cornus officinalis, and Orientation of Valoneoyl Group in Related Tannins

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Cornusiin A (1), cornusiin B (2) and cornusiin C (3), new dimeric monomeric and trimeric hydrolyzable tannins, were isolated from the fruits of cornus officinalis (Cornaceae). Their structures, including the orientation of the valoneoyl group in 1 and 3,were established on the basis of chemical and spectroscopic data. 2,3-Di-O-galloyl-D-glucose (7), 1,2,3-tri-O-galloyl-β-D-glucose, 1,2,6-tri-O-galloyl-β-D-glucose, 1,2,3,6-tetra-O-galloyl-β-D-glucose, gemin D (5), isoterchebin, tellimagrandin I (6) and tellimagrandin II were also isolated from the fruits. The orientation of the valoneoyl group in camptothin A (14) and that in camptothin B (15), which had been isolated from Camptotheca acuminata (Nyssaceae), were also determined based on that in 1.
公益社団法人日本薬学会の論文
1989-08-25