Synthesis of a Trisaccharide Related to the Cytotoxic Triterpenoid Saponins Isolated from the Bark of<i>Albizia procera</i>
作者:Qing-Chao Liu、Tian-Tian Guo、Cong Zhao、Jing Sun、Wen-Hong Li
DOI:10.1002/hlca.201300195
日期:2014.3
Chemical synthesis of a trisacchariderelated to the cytotoxictriterpenoidsaponinsisolatedfrom the bark of Albizia procera has been accomplished through a concise stepwise glycosylation strategy starting from commercially available D‐xylose, 2‐acetamido‐2‐deoxy‐D‐glucose and L‐arabinose. The target trisaccharide was designed with a 4‐methoxyphenyl (MP) aglycone to extend the scope of conversion
与从树皮中分离的细胞毒三萜皂苷三糖的化学合成合欢的Procera已经通过一个简明的逐步的糖基化策略来实现从市售起始d木糖,2-乙酰氨基-2-脱氧d葡萄糖和大号-arabinose 。目标三糖与4-甲氧基苯基(MP)糖苷配基一起设计,以通过选择性除去4-甲氧基苯基(MP)基团将转化范围扩展至合适的糖缀合物。一个意外的现象,即阿拉伯糖基残基假定为1 C 4构象,而不是典型的4 C 1形式,被观察到。脱保护可以恢复正常构象。
Synthesis of cholestane glycosides bearing OSW-1 disaccharide or its 1→4-linked analogue and their antitumor activities
作者:Dan Zheng、Liang Zhou、Yuyao Guan、Xiaozhuo Chen、Wanqi Zhou、Xiaoguang Chen、Pingsheng Lei
DOI:10.1016/j.bmcl.2010.07.085
日期:2010.9
For further structure-activity relationship (SAR) research of OSW saponins, a cholestane glycoside, namely 3 beta, 16 beta, 26-trihydroxycholest-5-en-22-one 16-O-(2-O-4-methoxybenzoyl-beta-D-xylopyranosyl)-(1 -> 3)-2-O- acetyl-alpha-L-arabinopyranoside (1) together with two 1 -> 4-linked disaccharide analogues (2 and 3) were synthesized. Their cytotoxic activities were evaluated by the standard MTT assay. Compound 1 showed potent cytotoxicity against five types of human tumor cells, with IC50 ranging between 1.3 and 73 nM. (c) 2010 Elsevier Ltd. All rights reserved.
Synthesis and antitumor activities of naturally occurring oleanolic acid triterpenoid saponins and their derivatives
作者:Qingchao Liu、Hongchun Liu、Lei Zhang、Tiantian Guo、Peng Wang、Meiyu Geng、Yingxia Li
DOI:10.1016/j.ejmech.2013.04.016
日期:2013.6
Twenty-six naturally occurring oleanolic acid saponins and their derivatives, 16 of which were synthesized in this study, were preliminarily evaluated against human cancer cells. From SAR studies, the presence of alpha-L-rhamnosyl residue at the terminal of both C-3 and C-28 position for oleanolic acid bidesmosides was important to enhance cytotoxicity, and introducing more sugar residues at C-3-OH of compound 12 with C-28 carboxylic acid is a favorable modification to ameliorate the anticancer activity. Furthermore, alpha-L-rhamnosyl moiety linked to C-2-OH of the first monosaccharide (alpha-L-alabinose, beta-D-xylose, beta-n-galactose or beta-D-glucose) in C-3-OH of oleanolic acid was helpful to improve the cytotoxicity. According to the predicted log P values, lipophilicity of the synthesized saponins was not an important factor for cytotoxicity. (C) 2013 Elsevier Masson SAS. All rights reserved.