作者:Rotem Perry-Feigenbaum、Phil S. Baran、Doron Shabat
DOI:10.1039/b915265b
日期:——
The quinone-methide elimination is a common, efficient methodology used in linkers designed to undergo self-fragmentation. Here, for the first time, we demonstrate this elimination in a pyridine ring system. Under physiological conditions, a compound constructed of a pyridine core, a reporter, and an enzymatic trigger underwent significantly faster 1,4-elimination than its parent compound with a benzene core. In addition, an AB2 self-immolative dendron based on a pyridine core released its two reporter units upon activation through 1,6- and 1,4 pyridinone-methide elimination reactions, again faster than the analogous benzene system. Increased aqueous solubility was observed with compounds based on pyridine relative to those based on benzene. The pyridinone-methide elimination could be applied as an alternative tool in designing self-immolative linkers for release of active target molecules in an aqueous environment.
醌-亚甲基消除反应是一种常见且高效的方法,常用于设计能够自我碎裂的连接剂。在这里,我们首次在吡啶环体系中演示了这种消除反应。在生理条件下,由吡啶核心、报告基和酶触发剂构建的化合物,其1,4消除反应的速度显著快于其苯核心的母体化合物。此外,基于吡啶核心的AB2自毁树枝状聚合物在通过1,6和1,4吡啶酮-亚甲基消除反应激活后,释放其两个报告基,速度同样快于类似的苯体系。与基于苯的化合物相比,基于吡啶的化合物表现出更好的水溶性。吡啶酮-亚甲基消除反应可以作为设计自我毁灭连接剂的替代工具,用于在水相环境中释放活性靶向分子。