(−)-Catechin glycosides from Ulmus davidiana
2014
Hosny, Mohammed | Zheng, Ming-Shan | Zhang, Haiyan | Chang, Hyun-Wook | Woo, Mi-Hee | Son, Jong-Keun | Lee, Sunny Kyung-Seon
Extensive chromatographic separation of the n-BuOH soluble fraction obtained from the stem and root barks of U. davidiana resulted in five hitherto unknown compounds together with a known one (−)-catechin 1. Structures of the five compounds were elucidated by chemical and spectroscopic analyses, to be (−)-catechin-7-O-gallate-5-O-(5″″-trans-caffeoyl)-β-D-apiofuranoside-3-O-β-D-apiofuranosyl-(1 → 2)-β-D-glucopyranoside 2, (−)-catechin-7-O-gallate-5-O-(5″″-trans-caffeoyl)-β-D-apiofuranoside-3-O-β-D-glucopyranoside 3, (−)-catechin-7-O-gallate-5-O-β-D-apiofuranoside-3-O-(2″-O-galloyl)-β-D-glucopyranoside 4, (−)-catechin-7-O-gallate-5-O-(5″″-trans-caffeoyl)-β-D-apiofuranoside 5, and (−)-catechin-7-O-gallate-5-O-(5″″-trans-feruloyl)-β-D-apiofuranoside 6.
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