N‐Heterocyclic Carbenes: Useful Ligands for the Palladium‐Catalysed Direct C5 Arylation of Heteroaromatics with Aryl Bromides or Electron‐Deficient Aryl Chlorides
作者:Ismail Ozdemir、Yetkin Gök、Özlem Özeroğlu、Murat Kaloğlu、Henri Doucet、Christian Bruneau
DOI:10.1002/ejic.200901195
日期:2010.4
Pd-N-heterocyclic carbene complexes have been prepared and employed for palladium-catalysed direct arylation of heteroaromatic derivatives by using aryl halides. These catalyst precursors promote the coupling of challenging aryl halides such as deactivated or congested aryl bromides and also activated aryl chlorides. This procedure employs only 1 mol-% of an air-stable palladium complex. This is a
已经制备了新的 Pd-N-杂环卡宾配合物,并将其用于钯催化使用芳基卤化物对杂芳族衍生物进行直接芳基化。这些催化剂前体促进了具有挑战性的芳基卤化物的偶联,例如失活或拥挤的芳基溴化物以及活化的芳基氯化物。该程序仅使用 1 mol% 的空气稳定钯配合物。与使用附着在空气敏感磷烷配体上的钯相比,这是一个实际优势,通常用于促进此类芳基卤化物的偶联。