1617-49-8Relevant articles and documents
Tannins and related polyphenols of euphorbiaceous plants. XI. Three new hydrolyzable tannins and a polyphenol glucoside from Euphorbia humifusa
Yoshida,Amakura,Liu,Okuda
, p. 1803 - 1807 (1994)
Three new hydrolyzable tannins, euphormisins M1, M2 and M3, were isolated from Euphorbia humifusa Willd., and respectively characterized as 1,3,6-tri-O-galloyl-4-O-brevifolincarboxyl-β-D-glucose (19), an oxidative metabolite (23) of geraniin, and 1,3,6-tri-O-galloyl-α-D-glucose (18), by spectroscopic and chemical methods. A new ellagic acid glucoside (16) and fifteen known tannins, including geraniin (8) and four dimers [euphorbins A (13), B (14), excoecarianin (15) and eumaculin A (12)], were also isolated.
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Row,Rao
, p. 357 (1962)
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Ellagic acid glycosides with hepatoprotective activity from traditional Tibetan medicine Potentilla anserina
Morikawa, Toshio,Imura, Katsuya,Akagi, Yoshinori,Muraoka, Osamu,Ninomiya, Kiyofumi
, p. 317 - 325 (2017/10/17)
Two new gallic acid glycosides, potentillanosides G (1) and H (2), were newly isolated from the methanol extract of the tuberous roots of Potentilla anserina (Rosaceae), together with a known compound, ellagic acid 3-O-α-l-rhamnopyranoside (3). Their structures were elucidated on the basis of chemical and physicochemical evidence. Among the constituents, potentillanoside H (2, IC50?=?99.5?μM) was found to show hepatoprotective activity.
Total synthesis of 3,3′,4-tri-O-methylellagic acid from gallic acid
Alam, Ashraful,Tsuboi, Sadao
, p. 10454 - 10465 (2008/02/12)
Total synthesis of 3,3′,4-tri-O-methylellagic acid has been described from commercially available gallic acid. Construction of the crucial unsymmetric Ar-Ar bond has been carried out in various methods such as Heck coupling, Heck coupling followed by oxidation or anionic Fries rearrangement, Suzuki cross-coupling, etc., but all the attempts were unsuccessful. Then, finally it has been achieved by intramolecular Ullmann coupling reaction.
