Palladium-Catalyzed Coupling of 3-Halo-Substituted Coumarins, Chromenes, and Quinolones with Various Nitrogen-Containing Nucleophiles
作者:Mohamed Ali Soussi、Davide Audisio、Samir Messaoudi、Olivier Provot、Jean-Daniel Brion、Mouâd Alami
DOI:10.1002/ejoc.201100480
日期:2011.9
An efficient and general palladium-catalyzed coupling reaction between 3-bromocoumarins, 3-bromoquinolin-2(1H)-ones, and 3-iodo-2H-chromenes with a variety of nitrogen-containing nucleophiles (azole, amide, lactam, sulfonamide, aniline, amine, and urea) is described. The reaction proceeded rapidly and cleanly in dioxane providing the coupling products in good to excellent yields. The chemoselectivity
3-溴香豆素、3-溴喹啉-2(1H)-酮和3-碘-2H-色烯与多种含氮亲核试剂(唑、酰胺、内酰胺、磺酰胺、苯胺、胺和尿素)进行了描述。该反应在二恶烷中快速而干净地进行,提供了良好至极好的产率的偶联产物。还使用多卤香豆素研究了该反应的化学选择性。在优化条件下,无论使用的含氮亲核试剂的性质如何,这些都在 C-3-Br 键处进行了位点选择性胺化。