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。