Highly efficient palladium-catalyzed cross-coupling of diarylborinic acids with arenediazoniums for practical diaryl synthesis
作者:Fengze Wang、Chen Wang、Guoping Sun、Gang Zou
DOI:10.1016/j.tetlet.2019.151491
日期:2020.2
A highly efficient cross-coupling of cost-effective diarylborinic acids with both isolatable and latent arenediazoniums, i.e. tetrafluoroborates and aryltriazenes, respectively, has been developed with a practical palladium catalyst system under base-free conditions in open flask at room temperature. A variety of electronically and sterically various biaryls, in particular, those bearing a coordinative
低成本的二芳基硼酸与可分离的和潜在的芳族重氮鎓(即四氟硼酸酯和芳基三氮烯)的高效交叉偶联已在实用的钯催化剂体系下,在无碱条件下于室温下在敞口烧瓶中开发出来。通过使用0.3mol%的乙酸钯作为催化剂,可以以良好或优异的产率获得多种电子和空间上不同的联芳基,特别是那些带有配位邻位取代基的联芳基。该方案的特征包括二芳基硼酸的成本效益,对杂原子邻位取代底物的功效以及对芳基氯化物的高化学选择性,已在杀菌剂Boscalid的实际合成中得到了明确证明。