Practical Iron- and Cobalt-Catalyzed Cross-Coupling Reactions between N-Heterocyclic Halides and Aryl or Heteroaryl Magnesium Reagents
作者:Olesya M. Kuzmina、Andreas K. Steib、Sarah Fernandez、Willy Boudot、John T. Markiewicz、Paul Knochel
DOI:10.1002/chem.201500747
日期:2015.5.26
The reaction scope of iron‐ and cobalt‐catalyzed cross‐couplingreactions in the presence of isoquinoline (quinoline) in the solvent mixture tBuOMe/THF has been further investigated. Various 2‐halogenated pyridine, pyrimidine, and triazine derivatives were arylated under these mild conditions in excellent yields. The presence of isoquinoline allows us to perform Fe‐catalyzed cross‐coupling reactions
Ligand-Accelerated Iron- and Cobalt-Catalyzed Cross-Coupling Reactions between N-Heteroaryl Halides and Aryl Magnesium Reagents
作者:Olesya M. Kuzmina、Andreas K. Steib、John T. Markiewicz、Dietmar Flubacher、Paul Knochel
DOI:10.1002/anie.201210235
日期:2013.4.26
Quinoline and isoquinoline dramatically increase the rate and yield of Fe‐ and Co‐catalyzed cross‐couplingreactions. This new catalytic process extends the scope of such cross‐couplingreactions to include complex functional groups and allows heteroaryl–heteroaryl bond formation to occur.
A Dichotomy in Cross-Coupling Site Selectivity in a Dihalogenated Heteroarene: Influence of Mononuclear Pd, Pd Clusters, and Pd Nanoparticles—the Case for Exploiting Pd Catalyst Speciation
作者:Neil W. J. Scott、Mark J. Ford、Neda Jeddi、Anthony Eyles、Lauriane Simon、Adrian C. Whitwood、Theo Tanner、Charlotte E. Willans、Ian J. S. Fairlamb
DOI:10.1021/jacs.1c05294
日期:2021.6.30
Given that Pd speciation, particularly aggregation, is known to lead to the formation of catalytically competent multinuclear Pdn species, the influence of these species on cross-coupling site-selectivity remains largely unknown. Herein, we disclose that multinuclear Pd species, in the form of Pd3-type clusters and nanoparticles, switch arylation site-selectivity from C2 to C4, in 2,4-dibromopyridine cross-couplings