Efficient and Selective Method for the Synthesis of Dihydrodipyridopyrazines Based on the Pd-Catalysed Amination of Halopyridines
作者:Oana-Irina Patriciu、Adriana-Luminiţa Fînaru、Stéphane Massip、Jean-Michel Léger、Christian Jarry、Gérald Guillaumet
DOI:10.1002/ejoc.200900404
日期:2009.8
A novel methodology for the efficient and selective synthesis of isomers A and B of N-substituted dihydrodipyridopyrazines was developed. The key step is the intermolecular coupling of aminopyridines and halonitropyridines/dihalopyridines in the presence of a catalyst system composed of Pd(OAc)2/Xantphos. This system displays good functional group compatibility and the desired C–N bond-forming process
开发了一种有效和选择性合成 N-取代二氢二吡啶并吡嗪的异构体 A 和 B 的新方法。关键步骤是在由 Pd(OAc)2/Xantphos 组成的催化剂体系存在下氨基吡啶和卤代硝基吡啶/二卤代吡啶的分子间偶联。该系统显示出良好的官能团兼容性,并且所需的 C-N 键形成过程以良好的产率进行。合适的硝基取代的 N,N'-二吡啶基胺的环化产生单取代的二氢二吡啶并吡嗪,它可以很容易地烷基化得到各种各样的不对称 5,10-二烷基-5,10-二氢二吡啶并[2,3-b:2',3 '-e]吡嗪(异构体A)和5,10-二烷基-5,10-二氢双吡啶并[2,3-b:3',2'-e]吡嗪(异构体B)。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)