26922-99-6Relevant academic research and scientific papers
Paeonianins A-E, new dimeric and monomeric ellagitannins from the fruits of Paeonia lactiflora
Tanaka, Takashi,Fukumori, Masatake,Ochi, Tomoko,Kouno, Isao
, p. 759 - 763 (2007/10/03)
Four new dimeric ellagitannins, paeonianins A-D (2-5), were isolated from the fruits of Paeonia lactiflora, together with a new ellagitannin monomer, paeonianin E (1). Their structures were determined by spectroscopic methods. Paeonianins A-D (2-5) are positional isomers formed by condensation of pentagalloyl-β-D-glucose (8) with 5-desgalloylstachyurin (6) or casuariin (7). Paeonianin E is a C-glycosidic ellagitannin having a gallic acid methyl ester moiety at the glucose C-1 position. This is the first report of the isolation of dimeric ellagitannins from a plant in the family Paeoniaceae.
Tannins and Related Polyphenols of Euphorbiaceous Plants. IV. Euphorbins A and B, Novel Dimeric Dehydroellagitannins from Euphorbia hirta L.
Yoshida, Takashi,Ling Chen,Shingu, Tetsuro,Okuda, Takuo
, p. 2940 - 2949 (2007/10/02)
Two new dimeric dehydroellagitannins, named euphorbin A (6) and euphorbin B (7), were isolated from the aerial parts of Euphorbia hirta, and their structures, containing 4C1 and 1C4 glucopyranose residues and a dehydrohexahydroxydiphenoyl group, were elucidated on the basis of chemical and spectral studies.Five monomeric hydrolizable tannins, i.e., 2,4,6-tri-O-galloyl-D-glucose, 1,3,4,6-tetra-O-galloyl-β-D-glucose, 1,2,3,4,6-penta-O-galloyl-β-D-glucose, geraniin and terchebin, as well as two quinic acid esters, i.e., 5-O-caffeoylquinic acid and 3,4-di-O-galloylquinic acid, and three flavonol glycosides were also isolated.Keywords - Euphorbia hirta; Euphorbiaceae; tannin; dimeric hydrolyzable tannin; euphorbin A; euphorbin B; dehydrohexahydroxydiphenoyl group; dehydroellagitannin
