A novel adduct of ECG fused to piceid and four new dimeric stilbene glycosides from Polygonum cuspidatum
作者:Ya-nan Yang、Fu-shuang Li、Fu Liu、Zi-ming Feng、Jian-shuang Jiang、Pei-cheng Zhang
DOI:10.1039/c6ra11135a
日期:——
Polyflavanostilbene B (1), an unusual adduct of epicatechin-3-O-gallate fused to piceid through a carbon–carbon bond, four new dimeric stilbene glycosides (2–5), three new stilbene glucosides (6–8), one new flavan glucoside (9), and six known compounds were isolated from the rhizome of Polygonum cuspidatum. The structures of these compounds were elucidated using spectroscopic data, including electronic
Polyflavanostilbene B(1),一种通过碳-碳键与哌啶融合的表儿茶素3- O-没食子酸酯的不寻常加合物,四个新的二苯乙烯基苷(2-5),三个新的stibulene糖苷(6-8),一个新的从虎杖的根茎中分离出黄酮苷(9)和6种已知化合物。使用光谱数据阐明了这些化合物的结构,包括电子圆二色性(ECD)和Rh 2(OCOCF 3)4诱导的CD光谱。使用阿卡波糖作为阳性对照,筛选所有化合物对α-葡萄糖苷酶的抑制活性(IC 50=385μM),并且对于化合物8观察到对α-葡糖苷酶的强抑制活性(IC 50=3.04μM)。