α-Hydroxyimine palladium complexes: Synthesis, molecular structure, and their activities towards the Suzuki–Miyaura cross-coupling reaction
作者:Xiao Tang、Ying-Tang Huang、Huan Liu、Rui-Zhi Liu、Dong-Sheng Shen、Ning Liu、Feng-Shou Liu
DOI:10.1016/j.jorganchem.2013.01.018
日期:2013.4
[Ar–NC(R)–(R)C(CH3)OH] (L1, R = Acenaphthyl, Ar = 2,6-diisopropylphenyl; L2, R = Ph, Ar = 2,6-dimethylphenyl; L3, R = Ph, Ar = 2,6-diisopropylphenyl). The reaction of PdCl2 with 1 equiv of the ligand L1–3 in methanol affords the four-coordinate palladium complex with the general formula LPdCl2 (1–3). The molecular structures of L3, as well as the palladium complexes 1 and 3, were established by single-crystal
这项研究提出了一种无磷催化体系的活性促进策略。该策略基于一系列具有大取代基的非共轭N,O配体[Ar–N C(R)–(R)C(CH 3)OH](L1,R = ena基,Ar = 2,6 -diisopropylphenyl; L2,R =苯基,Ar为2,6-二甲基苯基; L3,R =苯基,Ar为2,6-二异丙基)。的PdCl的反应2与1个当量配体L1 - 3在甲醇中,得到四配位的钯络合物与通式LPdCl 2(1 - 3)。L3的分子结构以及钯配合物1和3通过单晶X射线衍射研究确定。这些钯配合物作为前催化剂的应用已在一系列芳基溴化物与芳基硼酸的Suzuki-Miyaura交叉偶联中得到了检验。结合了庞大的取代基的图3显示出在钯负载量为0.01mol%时在交叉偶联反应中有效,从而以高收率提供了相应的联芳基。