The ruthenium-catalyzed direct ortho-arylation reactions of 2-phenylpyridine and 2-aryloxazolines have been successfully expanded to the direct aryl–heteroaryl coupling reactions using heteroaryl bromides. The reaction mechanism involving the RuII/RuIV intermediates is proposed from the results of the stoichiometric reaction of a divalent ruthenacycle complex of 2-phenylpyridine with bromobenzene.
钌催化的2-苯基吡啶和2-芳基恶唑啉的直接邻芳基化反应已成功扩展为使用杂芳基溴化物的直接芳基-杂芳基偶联反应。从2-苯基吡啶与溴苯的二价钌循环络合物的化学计量反应结果,提出了涉及Ru II / Ru IV中间体的反应机理。