Synthesis and Biological Evaluation of Gephyronic Acid Derivatives: Initial Steps towards the Identification of the Biological Target of Polyketide Inhibitors of Eukaryotic Protein Synthesis
作者:Timo Anderl、Lionel Nicolas、Johanna Münkemer、Yazh Muthukumar、Angelika Baro、Wolfgang Frey、Florenz Sasse、Richard E. Taylor、Sabine Laschat
DOI:10.1002/ejoc.201101129
日期:2011.12
Coupled to the development of a total synthesis of gephyronic acid, a series of diastereomeric analogues and their precursors have been prepared by employing complementary aldol strategies for the key coupling step of fragments 4 and 5. A biological evaluation revealed the importance of the epoxide for the cytotoxicity against L-929 (mouse fibroblast) and KB-3-1 (HeLa clone, human cervix carcinoma
结合gephyronic acid 全合成的发展,通过对片段4 和5 的关键偶联步骤采用互补醛醇策略制备了一系列非对映异构体类似物及其前体。生物学评估揭示了环氧化物对于对 L-929(小鼠成纤维细胞)和 KB-3-1(HeLa 克隆,人子宫颈癌衍生)细胞系的细胞毒性。此外,发现 C3-C5 立体三单元组和 C1 羧酸的构型变化是重要的特征。当 C1 处的羧基末端被甲基酯或 PMB 保护的醇取代时,观察到与天然产物相比活性有所提高。令人惊讶的是,衍生物 (8R) -17d 和 (8S) -16a 显示出对铜绿假单胞菌的抗菌活性。