Towards the discovery of drug-like epigallocatechin gallate analogs as Hsp90 inhibitors
作者:Rohit Bhat、Amna T. Adam、Jungeun Jasmine Lee、Thomas A. Gasiewicz、Ellen C. Henry、David P. Rotella
DOI:10.1016/j.bmcl.2014.03.088
日期:2014.5
( - )-Epigallocatechin gallate (EGCG) is the major flavonoid of green tea and has been widely explored for a range of biological activities including anti- infective, anti-inflammatory, anti-cancer, and neuroprotection. Existing structure-activity data for EGCG has been largely limited to exploration of simple ethers and hydroxyl deletion. EGCG has poor drug-like properties because of multiple phenolic hydroxyl moieties and a metabolically labile ester. This work reports a substantial expansion of structure-activity understanding by exploring a range of semi-synthetic and synthetic derivatives with ester replacements and variously substituted aromatic and alicyclic groups containing more drug-like substituents. Structure-activity relationships for these molecules were obtained for Hsp90 inhibition. The results indicate that amide and sulfonamide linkers are suitable ester replacements. Hydroxylated aromatic rings and the cis- stereochemistry in EGCG are not essential for Hsp90 inhibition. Selected analogs in this series are more potent than EGCG in a luciferase refolding assay for Hsp90 activity. (C) 2014 Elsevier Ltd. All rights reserved.
(-)-表没食子儿茶素没食子酸酯(EGCG)是绿茶的主要黄酮类化合物,已被广泛研究用于多种生物活性,包括抗感染、抗炎、抗癌和神经营养。现有的EGCG结构活性数据主要局限于对简单醚和羟基缺失的探索。由于多个酚羟基和代谢不稳定的酯,EGCG的药物样性质较差。
本研究通过探索一系列半合成和合成的衍生物,显著扩展了结构活性的理解。这些衍生物具有酯替换和各种取代的芳香族和脂环族基团,包含更多的药物样取代基。获得这些分子的Hsp90抑制结构活性关系。
结果表明,酰胺和磺酰胺连接物是适合的酯替换。羟基化的芳香环和EGCG中的顺式立体化学并非Hsp90抑制所必需。系列中的选定类似物在Hsp90活性的荧光素酶重折叠测定中比EGCG更有效。© 2014 Elsevier Ltd. 保留所有权利。