Iterative and regioselective cross-couplings of 2-chloro-3,4-diiodopyridine leading to 2,3,4-triheteroarylpyridines
作者:Laura M. Daykin、Jamie S. Siddle、Adrian L. Ankers、Andrei S. Batsanov、Martin R. Bryce
DOI:10.1016/j.tet.2009.11.066
日期:2010.1
A one-pot synthesis of 2-chloro-3,4-diiodopyridine from 2-chloropyridine is described via a Directed ortho Metallation (DoM)/Halogen Dance (HD) mechanism in 26–28% yields. By performing sequential, iterative Suzuki–Miyaura cross-couplings using a variety of functionalised heteroaryl and arylboronic acids, a series of novel 2,3,4-triheteroarylpyridine scaffolds have been accessed in synthetically viable
通过定向邻位金属化(D oM)/ Halogen Dance(HD)机制,产率为26–28%。通过使用各种官能化的杂芳基和芳基硼酸进行顺序的,迭代的Suzuki-Miyaura交叉偶联,已经获得了一系列合成上可行的新型2,3,4-三杂芳基吡啶骨架,包括空间受阻的衍生物。还报道了2-氯-4-杂芳基-3-碘吡啶和2-氯-3,4-二杂芳基吡啶。通过两步Sonogashira / Suzuki-Miyaura反应序列由2-氯-3,4-二碘吡啶和苯基乙炔合成5- [3,4-双(2-苯基乙炔基)吡啶-2-基] -2-氟吡啶6-氟吡啶-3--3-基硼酸的总收率达到48%。