Pd-Catalyzed Cross-Coupling of Hindered, Electron-Deficient Anilines with Bulky (Hetero)aryl Halides Using Biaryl Phosphorinane Ligands
作者:Alison M. Wilders、Jeremy Henle、Michael C. Haibach、Rafal Swiatowiec、Jeffrey Bien、Rodger F. Henry、Shardrack O. Asare、Amanda L. Wall、Shashank Shekhar
DOI:10.1021/acscatal.0c04280
日期:2020.12.18
ligands for Pd-catalyzed coupling of hindered, electron-deficient anilines with hindered (hetero)aryl halides, a challenging class of C–N cross-coupling reaction with few precedents. Broad substrate scope and functional group tolerance were observed under the reaction conditions. Computational studies suggest that ligands containing phenyl substituents provide greater activity through more favorable
由联芳基伯膦加成反式,反式衍生的联芳基膦烷配体-二亚苄基丙酮(AlisonPhos和AliPhos)形成受阻电子缺陷苯胺与受阻(杂)芳基卤化物的钯催化偶联的高活性配体,这是一类具有挑战性的C-N交叉偶联反应,几乎没有先例。在反应条件下观察到较宽的底物范围和官能团耐受性。计算研究表明,与烷基取代的膦亚胺相比,含苯基取代基的配体通过更有利的苯胺键合在催化循环中提供更大的活性。在1,1,1,1,3,3,3-六氟异丙醇(HFIP)中,通过将伯联芳基膦在1,1,1,3,3,3-六氟异丙醇(HFIP)中的磷-迈克尔加成反应,合成联芳基膦酸酯的一般和高产程序还描述了相对温和的条件(23–110°C)。