From the water-soluble fraction of a methanol extract of leaves of Alangiumpremnifolium, two new megastigmaneglycosides, alangionosides N and O, along with three known megastigmaneglycosides, dendranthemoside A and alangionosides A and B, were isolated. Shimaurinosides A and B, xylopyranosyl(1-->6)glucopyranosides of simplealcohols were also found to be constituents of the water-soluble fraction
从 Alangium premnifolium 叶子的甲醇提取物的水溶性部分中,分离出两种新的 megastigmane 苷、alangionosides N 和 O,以及三种已知的 megastigmane 苷、dendranthemoside A 和 alangionosides A 和 B。Shimaurinosides A 和 B,简单醇的吡喃木糖苷 (1-->6) 吡喃葡萄糖苷也被发现是水溶性部分的成分。通过光谱分析确定结构。
Gallates of isoorientin and (2S)-1,2-propanediol glucoside from the leaves of Schoepfia jasminodora
From the 1-BuOH-soluble fraction of a MeOH extract of the leaves of Schoepfia jasminodora collected from Okinawa Island, two new galloyl esters and 15 known compounds were isolated. The structures of the new compounds were elucidated by spectroscopic analysis to be isoorientin 4″-O-gallate and (2S)-1,2-propanediol 1-O-β-d-glucopyranoside 6′-O-gallate. The compounds possessing galloyl or cathechol moieties showed equal radical scavenging activity.