Secondary Phosphine Oxide Preligands for Palladium-Catalyzed C-H (Hetero)Arylations: Efficient Access to Pybox Ligands
作者:Debasish Ghorai、Valentin Müller、Helena Keil、Dietmar Stalke、Giuseppe Zanoni、Boryslav A. Tkachenko、Peter R. Schreiner、Lutz Ackermann
DOI:10.1002/adsc.201700663
日期:2017.9.18
C–H arylations of oxazolines were accomplished with a well‐defined palladium catalyst derived from a secondary bisdiamantyl phosphine oxide. The single‐component secondary phosphine oxide (SPO)‐palladium complex enabled C–H activations with aryl bromides and challenging aryl chlorides in the absence of directing groups, setting the stage for the step‐economical synthesis of pybox ligands under racemization‐free
恶唑啉的C–H芳基化反应是使用衍生自仲双双金刚烷基氧化膦的明确定义的钯催化剂完成的。单组分仲氧化膦(SPO)-钯配合物可在没有引导基团的情况下用芳基溴化物和具有挑战性的芳基氯化物进行C-H活化,为在无消旋反应条件下逐步经济地合成pybox配体奠定了基础。