Synthesis of quinoxalines and pyrido[2,3-b]pyrazines by Suzuki–Miyaura cross-coupling reaction
作者:Arjun Kumbhar、Sanjay Jadhav、Rajashri Salunkhe
DOI:10.1007/s11164-015-2377-7
日期:2016.6
Bromo-substituted quinoxalines and pyrido[2,3-b]pyrazines were synthesized by condensation reactions of aromatic 1,2-diamino and 1,2-diketone compounds. These compounds were used as common intermediates for postcondensation modification by Suzuki–Miyaura coupling reaction to form aryl-substituted quinoxalines and pyrido[2,3-b]pyrazines. High-efficiency with improved product yield of aryl-substituted quinoxalines and pyrido[2,3-b]pyrazine derivatives was achieved by conducting a coupling reaction in presence of Pd(dppf)Cl2·CH2Cl2 in tetrahydrofuran (THF) using K2CO3 as base at reflux temperature.
以芳香1,2-二胺和1,2-二酮化合物的缩合反应合成了溴取代的喹喏啉和吡啶[2,3-b]呲唑。这些化合物被用作后续缩合修饰的常见中间体,通过铃木-宫浦偶联反应形成芳基取代的喹喏啉和吡啶[2,3-b]呲唑。通过在四氢呋喃(THF)中使用K2CO3作为碱,加入Pd(dppf)Cl2·CH2Cl2并在回流温度下进行偶联反应,成功实现了芳基取代的喹喏啉和吡啶[2,3-b]呲唑衍生物的高效合成,且产率有所提高。