Two new hemiterpene glycosides from the leaves of Ilex rotunda. thunb
作者:Manh Heun Kim、Kwan Hee Park、Myeong Hwan Oh、Han Hyuk Kim、Kang In Choe、Sang Hee Park、Min Won Lee
DOI:10.1007/s12272-012-1010-1
日期:2012.10
Chromatographic separation of the 80% MeOH extract of the leaves of Ilex rotunda (IR) led to isolation of two new hemiterpene glycosides, tentatively named as rotundarpenoside A (1) and rotundarpenoside B (2), along with five known caffeoyl derivatives (3–7). The chemical structures of these compounds were elucidated using 1D/2D NMR, HR-MS, and the absolute configuration was confirmed by Mosher’s method. In order to evaluate their anti-oxidative activities, 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical scavenging activity and xanthine oxidase superoxide scavenging activities (NBT) were determined.
对圆叶冬青 (IR) 叶子的 80% 甲醇提取物进行色谱分离,分离出两种新的半萜糖苷,暂定名为 rotundarpenoside A (1) 和 rotundarpenoside B (2),以及五种已知的咖啡酰衍生物 (3– 7).使用1D/2D NMR、HR-MS阐明了这些化合物的化学结构,并通过Mosher方法确认了绝对构型。为了评价它们的抗氧化活性,测定了1,1-二苯基-2-三硝基苯肼(DPPH)自由基清除活性和黄嘌呤氧化酶超氧化物清除活性(NBT)。