Comparison of dppf‐Supported Nickel Precatalysts for the Suzuki–Miyaura Reaction: The Observation and Activity of Nickel(I)
作者:Louise M. Guard、Megan Mohadjer Beromi、Gary W. Brudvig、Nilay Hazari、David J. Vinyard
DOI:10.1002/anie.201505699
日期:2015.11.2
Ni‐based precatalysts for the Suzuki–Miyaura reaction have potential chemical and economic advantages compared to commonly used Pd systems. Here, we compare Ni precatalysts for the Suzuki–Miyaura reaction supported by the dppf ligand in 3 oxidation states, 0, I and II. Surprisingly, at 80 °C they give similar catalytic activity, with all systems generating significant amounts of NiI during the reaction
与常用的Pd系统相比,Suzuki-Miyaura反应的镍基预催化剂具有潜在的化学和经济优势。在这里,我们比较了dppf配体在3种氧化态(0,I和II)下对Suzuki-Miyaura反应的Ni预催化剂。出人意料的是,在80℃下它们得到类似的催化活性,其中所有系统产生显著的Ni的余在反应过程中。在室温下,易于获得的台式稳定的Ni II预催化剂具有很高的活性,可以偶联重要的合成杂环底物。我们的工作最终确定了Ni I物种与通常仅涉及Ni 0和Ni II配合物的反应有关。