Insights into the Catalytic Activity of [Pd(NHC)(cin)Cl] (NHC=IPr, IPrCl, IPrBr) Complexes in the Suzuki–Miyaura Reaction

Insights into the Catalytic Activity of [Pd(NHC)(cin)Cl] (NHC=IPr, IPrCl, IPrBr) Complexes in the Suzuki–Miyaura Reaction
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深入了解 [Pd(NHC)(cin)Cl] (NHC=IPr, IPrCl, IPrBr) 配合物在 Suzuki-Miyaura 反应中的催化活性

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发表时间:
2018
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影响因子:
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通讯作者:
S. Nolan
S. Nolan
中科院分区:
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作者:
Frédéric Izquierdo;C. Zinser;Y. Minenkov;D. Cordes;A. Slawin;L. Cavallo;Fady Nahra;C. Cazin;S. Nolan

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研究了 C4,5-卤化对钯 N-杂环卡宾配合物及其在 Suzuki-Miyaura 反应中活性的影响。合成了两种带有 IPrCl 和 IPrBr 配体的 [Pd(NHC)(cin)Cl] 配合物(IPr=1,3-双(2,6-二异丙基-苯基)咪唑-2-亚基;cin=肉桂基)。确定这些配体的电子和空间性质后,将它们的性质与 [Pd(IPr) (cin)Cl] 的性质进行比较。通过使用 DFT 计算来研究这三种钯配合物,以描述它们在产生假定的 12 电子活性催化剂的活化步骤中的行为。通过实验,研究了它们在低催化剂负载量下涉及多种偶联伙伴(30 个条目)的铃木-宫浦反应中的催化活性。
The influence of C4,5‐halogenation on palladium N‐heterocyclic carbene complexes and their activity in the Suzuki–Miyaura reaction were investigated. Two [Pd(NHC)(cin)Cl] complexes bearing IPrCl and IPrBr ligands (IPr=1,3‐bis(2,6‐diisopropyl‐phenyl)imidazol‐2‐ylidene; cin=cinnamyl) were synthesized. After determining the electronic and steric properties of these ligands, their properties were compared to those of [Pd(IPr) (cin)Cl]. The three palladium complexes were studied by using DFT calculations to delineate their behavior in the activation step leading to the putative 12‐electron active catalyst. Experimentally, their catalytic activity in the Suzuki–Miyaura reaction involving a wide range of coupling partners (30 entries) at low catalyst loading was studied.
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