Ni-Catalyzed Reductive Homocoupling of Unactivated Alkyl Bromides at Room Temperature and Its Synthetic Application
作者:Yu Peng、Long Luo、Chang-Song Yan、Jian-Jian Zhang、Ya-Wen Wang
DOI:10.1021/jo401936v
日期:2013.11.1
unactivated primary, secondary, and tertiary alkyl bromides is described. The catalytic system can be easily generated from air-stable and cheap materials and demonstrates broad functional group tolerance, thus allowing facile access to useful dimeric triterpene and lignan-like molecules. Moreover, the dimerization of tertiary bromide 6 efficiently establishes sterically hindered vicinal quaternary
描述了一种室温镍催化的还原方法,用于未活化的伯,仲和叔烷基溴的均相偶联。催化体系可以容易地由空气稳定且廉价的材料产生,并显示出宽泛的官能团耐受性,因此可以轻松获得有用的二聚三萜和木脂素样分子。而且,叔溴化物6的二聚作用有效地建立了位阻式邻位季碳(C3a和C3a'),这是有趣的双吡咯并[2,3- b ]二氢吲哚生物碱的关键连接,从而使我们能够完成总外消旋体的合成。烟嘌呤(9)和叶硫蒽(10))。另外,该二聚方法可扩展为双过氢呋喃[2,3- b ]呋喃(5a)和二聚螺酮5b的高度立体选择性合成,这表明可能涉及自由基。