Monosubstituted, Anionic Imidazolyl Ligands from N−H NHC Precursors and Their Activity in Pd‐Catalyzed Cross‐Coupling Reactions
Monosubstituted, Anionic Imidazolyl Ligands from N−H NHC Precursors and Their Activity in Pd‐Catalyzed Cross‐Coupling Reactions
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来自 N·H NHC 前体的单取代阴离子咪唑基配体及其在 Pd 催化交叉偶联反应中的活性
DOI:
10.1002/adsc.202000483
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发表时间:
2020
影响因子:
5.4
通讯作者:
Michaelis, David J.
中科院分区:
文献类型:
--
作者:
Martinez, Erin E.;Jensen, Christopher A.;Larson, Alexandra J. S.;Kenney, Karissa C.;Clark, Kyle J.;Nazari, S. Hadi;Valdivia‐Berroeta, Gabriel A.;Smith, Stacey J.;Ess, Daniel H.;Michaelis, David J.
We report that treatment of several 2‐diphenylphosphinoimidazoles with Pd(II) salts generates monosubstituted N−H NHC−Pd complexes via insertion into the C−P bond. Removal of the N−H proton in situ leads to anionic (X‐type) or imidazolyl‐Pd complexes that are highly stable and catalytically active, achieving up to 340,000 turnovers at 1 ppm catalyst loading in Suzuki‐Miyaura reactions. DFT‐calculated Tolman electronic parameters for the sterically small ligands suggest that these ligands are significantly more donating than traditional NHCs, which provides a rationale for rapid cross‐coupling catalysis. Excellent reactivity is also demonstrated in Sonogashira reactions.
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