Four new oleanane-type triterpenoidal glycosides, named gleditsiosides A-D (1-4), were isolated from the anomalous fruits of Gleditsia sinensis. Using modern NMR techniques, including DQF-COSY, HETCOR, HOHAHA, HMBC, and ROESY experiments and MS analysis as well as chemical methods, their structures were determined as 3-O-beta-D-xylopyranosyl-(1-->2)-alpha-L-arabinopyranosyl-(1-->6)- bet a-D-glucopyranosyl
Studies on the constituents of leguminous plants. VI. The structure elucidations of monoterpene glycosides from fruits of Gymnocladus chinensis Baillon.
作者:TAKAO KONOSHIMA、TOKUNOSUKE SAWADA
DOI:10.1248/cpb.32.2617
日期:——
Two monoterpene glycosides 1 and 2 were isolated from the fruits of Gymnocladus chinensis BAILLON (Leguminosae). On the basis of chemical and physicochemical evidence, these glycosides were characterized as (6S)-2-trans-6-α-L-arabinopyranosyloxy-2, 6-dimethyl-2, 7-octadienoic acid and (6S)-2-trans-2, 6-dimethyl-6-[3-O-(β-D-glucopyranosyl)-4-O-(2-methylbutyroyl)-α-L-arabino-pyranosyloxy]-2, 7-octadienoic acid.
Two undescribed oleanane-type saponins, julibrosides K-L, along with three undescribed oleanane-type prosapogenins, julibrosides M-O, were isolated from the stem bark of Albizia julibrissin Durazz. and the mild alkaline hydrolysate of the total saponin, respectively. Their structures were established by extensive analysis of 1D and 2D NMR experiments (COSY, TOCSY, HSQC, HMBC, and HSQC-TOCSY) and mass
New CuCl2-induced glucoside esters and other constituents from Portucala oleracea
作者:Bin Wu、Liyan Yu、Xiaodan Wu、Jianbo Chen
DOI:10.1016/j.carres.2012.01.012
日期:2012.4
Two new glucoside esters 1 and 2 were produced as stress metabolites in the fresh leaves of Portulaca oleracea, in response to abiotic stress elicitation by CuCl(2). A new sugar ester (3) and two known compounds (4 and 5) were also isolated. Their structures were established by spectroscopic means. The antioxidative activities of stress metabolites and the related isolates were evaluated by DPPH assay
configurations were determined by extensive spectroscopic analysis including one-dimensional [1D] and two-dimensional [2D] nuclear magnetic resonance [NMR], high-resolution electrospray ionization mass spectroscopy [HR-ESI-MS] analysis, and chemical methods. Erythrosides A-G featured a diverse oligosaccharide chain containing 4-6 pentoses or hexoses at C-3 and a monoterpenic acid or a (E)-cinnamic acid unit
Erythrosides AG 是七种未描述的齐墩果型三萜皂苷,是从 Erythrophleum fordii 的种子中分离出来的。它们的绝对构型结构是通过广泛的光谱分析确定的,包括一维 [1D] 和二维 [2D] 核磁共振 [NMR]、高分辨率电喷雾电离质谱 [HR-ESI-MS] 分析和化学分析。方法。赤藓糖苷 AG 具有多样化的寡糖链,在 C-3 处包含 4-6 个戊糖或己糖,在 C-21 位置包含一个单萜酸或 (E)-肉桂酸单元。特别令人感兴趣的是,赤藓糖苷 AC、E 和 F 在它们的糖链中含有一种罕见的 α 木糖。生物测定结果表明,赤藓糖苷 AC 对人肺癌细胞系 PC9 显示出中等的细胞毒活性,IC50 值为 13.14、16。