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.
An Improved Synthesis of Methyl Protodioscin: Tautomerization and Direct Access to the 3-O-Substituted Kryptogenin
The acid-catalyzed tautomerization of 3-O-substituted kryptogenin 2 was studied, and the effects of acids such as silica gel, TMSOTf, acetic acid, and CDCl3, are discussed. Additionally, a Zn/KI/HOAc reduction based on this tautomerization was adopted, which afforded 2 directly, and provided a facile procedure for the synthesis of methyl protodioscin and other furostanol saponins in a mild way.
Synthesis, conformational analysis and SAR research of OSW-1 analogues
作者:Chao Liu、A-peng Wang、Longlong Jin、Yanshen Guo、Yan Li、Zhehui Zhao、Pingsheng Lei
DOI:10.1016/j.tet.2016.05.049
日期:2016.7
1→4)-2-O-acetyl-α-l-arabinopyranosyl)] with three different steroidal sapogenins at 16β-hydroxy. Their conformation was analyzed with NMR spectroscopy and molecule simulation. The arabinose moiety of 1–3 linked analogues was in chair conformation and 1–4 linked analogues was in boat conformation. 1–3 linked analogues exhibited potent anti-proliferation activity against a panel of human tumor cells
通过偶联二糖(2 - O -4-甲氧基苯甲酰基-β - d-吡喃并吡喃糖基- (1→3)-2 - O-乙酰基-α - 1-阿拉伯吡喃糖基)或(2- O -4-(E)-肉桂酰基-β- d-吡喃并吡喃糖基- (1→3)-2 - O-乙酰基-α - 1-阿拉伯吡喃糖基)和它们的1→4连接的类似物[(2- O -4-甲氧基苯甲酰基-β- d-吡喃喃糖基- (1→4)-2 - O-乙酰基-α - 1-阿拉伯吡喃糖基)或(2- O -4-(E)-肉桂酰基-β- d-吡喃木糖基- (1→4) -2- O-乙酰基-α- 1-阿拉伯吡喃糖基]],在16β-羟基上具有三种不同的甾体皂苷元。用NMR光谱和分子模拟分析了它们的构象。1–3个连接类似物的阿拉伯糖部分呈椅子构型,而1–4个连接类似物呈船形。1-3个连接的类似物在纳摩尔浓度水平下对一组人类肿瘤细胞表现出有效的抗增殖活性,而1-4个连接的类似物则没有抗肿