Methods for the total chemical synthesis of enantiomerically-pure 7-(2′-trimethylsilyl)ethyl camptothecin
申请人:Chen Xinghai
公开号:US08722886B1
公开(公告)日:2014-05-13
The present invention discloses and claims five (5) novel, highly efficient synthetic routes for the total synthesis of enantiomerically-pure (i.e., 99%) 7-(2′-trimethylsilyl)ethyl camptothecin (BNP1350; Karenitecin; Cositecan). These aforementioned synthetic schemes are the first to disclose the total syntheses of 7-(2′-trimethylsilyl)ethyl camptothecin using a highly novel direct, non-linear and convergent synthetic strategy which involves annealing the key C7-(trimethylsilyl)ethyl side chain-bearing A ring key synthons to an enantiomerically-pure tricyclic pyridone; rather than through the conventional methodology which incorporates the C7-(trimethylsilyl)ethyl side chain as the final synthetic step on a totally synthesized camptothecin parent compound. The current novel synthetic approaches reported herein since utilize desirably functionalized A-ring with preinstalled trimethyl silyl ethyl side chain, the aforementioned synthetic methodologies have a wider scope of making wide range of pharmaceutically relevant A-ring substituted BNP1350 analogs by substituting desirably functionalized nitro or protected amino phenyl carboxy A-ring as the starting material.
本发明披露并声明了五种新颖、高效的合成路线,用于对对映纯度(即99%)的7-(2′-三甲基硅基)乙基喜树碱(BNP1350; 卡瑞尼喜树碱; 科西替坎)进行全合成。这些合成方案是首次披露了使用一种高度新颖的直接、非线性和汇聚的合成策略来合成7-(2′-三甲基硅基)乙基喜树碱,该策略涉及将关键的C7-(三甲基硅基)乙基侧链的A环关键合成子与对映纯的三环吡啶酮进行退火;而不是通过传统方法,该传统方法将C7-(三甲基硅基)乙基侧链作为最终合成步骤添加到完全合成的喜树碱母体化合物上。自从利用具有预安装的三甲基硅基乙基侧链的A环进行合成后,本文报告的当前新颖合成方法可以通过用具有理想功能化的硝基或保护氨基苯基羧基A环作为起始物质,扩大范围制备广泛的与药物相关的A环取代BNP1350类似物。