An efficient Palladium/Copper bimetallic co-catalyzed direct 2-arylation of benzoxazoles with aryl chlorides is presented. The Pd(OAc)2/CuI/NiXantphos-based catalyst enables the installation of various aryl and heteroaryl groups in good to excellent yields (75–99%). Preliminary mechanism investigation indicates that Pd/Nixantphos complex activates C-Cl bond of aryl chlorides via oxidative addition
提出了一种有效的钯/铜双金属共催化的苯并恶唑与芳基氯化物的2-芳基化反应。基于Pd(OAc)2 / CuI / NiXantphos的催化剂能够以优异的产率(75-99%)安装各种芳基和杂芳基。初步的机理研究表明,Pd / Nixantphos配合物通过氧化加成激活芳基氯的C-Cl键,而Cu / Nixantphos配合物与氮原子螯合以降低苯并恶唑中2-H的pK a。