135909-74-9Relevant academic research and scientific papers
A-TYPE PROANTHOCYANIDINS FROM STEM-BARK OF PAVETTA OWARIENSIS
Balde, A. M.,Pieters, L. A.,Gergely, A.,Kolodziej, H.,Claeys, M.,Vlietinck, A. J.
, p. 337 - 342 (1991)
In a chemical investigation on the stem-bark of Pavetta owariensis, a new proanthocyanidin A-type, ent-epicatechin (4α->8,2α->O->7)-ent-catechin, designated as pavetannin A1, was isolated as second representative of a (2α,4α) A-type proanthocyanidin.Additionally, the occurrence of (+)-catechin, (-)-epicatechin, ent-epicatechin, proanthocyanidin A-2 and proanthocyanidin A-4 was demonstrated, the latter being reported from a natural source for the second time.
Proanthocyanidins and a phloroglucinol derivative from Rumex acetosa L.
Bicker,Petereit,Hensel
experimental part, p. 483 - 495 (2010/06/15)
From the ethyl acetate soluble fraction of an acetone-water extract of the aerial parts of Rumex acetosa L. (Polygonaceae), a variety of monomeric flavan-3-ols (catechin, epicatechin, epicatechin-3-O-gallate), A- and B-type procyanidins and propelargonidins (15 dimers, 7 trimers, 2 tetramers) were isolated with 5 so far unknown natural products. Dimers: procyanidin B1, B2, B3, B4, B5, B7, A2, epiafzelechin-(4β→8)-epicatechin, epiafzelechin-(4β→8)-epicatechin-3-O-gallate (new natural product), epiafzelechin-(4β→6)-epicatechin-3-O-gallate (new natural product), epiafzelechin-3-O-gallate-(4β→8)-epicatechin-3-O-gallate, B2-3′-O-gallate, B2-3,3′-di-O-gallate, B5-3′-O-gallate, and B5-3,3′-di-O-gallate. Trimers: procyanidin C1, epiafzelechin-(4β→8)-epicatechin-(4β→8)-epicatechin (new natural product), epicatechin-(4β→8)-epicatechin-(4β→8)-catechin, cinnamtannin B1, cinnamtannin B1-3-O-gallate (new natural product), tentatively epicatechin-(2β→7, 4β→8)-epiafzelechin-(4α→8)-epicatechin (new natural product), and epicatechin-3-O-gallate-(4β→8)-epicatechin-3-O-gallate-(4β→8)-epicatechin-3-O-gallate. Tetramers: procyanidin D1 and parameritannin A1. All compounds were elucidated by ESI-MS, CD spectra, 1D- and 2D-NMR experiments as free phenols or peracetylated derivatives and, in part, after partial acid-catalysed degradation with phloroglucinol. A more abundant proanthocyanidin polymer was also isolated, purified and its chemical composition studied by 13C NMR. In addition a so far unknown phloroglucinolglycoside (1-O-β-d-(2,4-dihydroxy-6-methoxyphenyl)-6-O-(4-hydroxy-3,5-dimethoxybenzoyl)-glucopyranoside) was isolated.
