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Updated: May 24, 2025

Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
Published on: July 30, 2017
Enabling Aryl Chloride-Mediated Palladium/Norbornene Cooperative Catalysis
Rong Ye1, Xin Liu1, Guangbin Dong1
1Department of Chemistry, University of Chicago, Chicago, IL, 60637, USA.
This study introduces a new catalytic method for functionalizing aryl chlorides, expanding the use of palladium/norbornene (Pd/NBE) catalysis. This breakthrough enables broader applications in organic synthesis and drug discovery.
Area of Science:
- Organic Chemistry
- Catalysis
- Synthetic Methodology
Background:
- Palladium/norbornene (Pd/NBE) cooperative catalysis is valuable for arene functionalization.
- Previous Pd/NBE catalysis was limited to reactive aryl iodides and bromides.
- Aryl chlorides, a more accessible feedstock, were not suitable substrates for this catalysis.
Purpose of the Study:
- To develop the first general palladium/norbornene (Pd/NBE)-catalyzed vicinal difunctionalization of aryl chlorides.
- To broaden the substrate scope of Pd/NBE catalysis to include aryl chlorides.
Main Methods:
- Utilized a combination of secondary-amide-substituted norbornenes (NBEs) and XPhos ligand.
- Developed conditions for the ortho-alkylation, amination, and acylation of diverse aryl chlorides.
- Achieved various ipso terminations, including olefination, hydrogenation, and alkynylation.
Main Results:
- Successfully demonstrated the first general Pd/NBE-catalyzed vicinal difunctionalization of aryl chlorides.
- Showcased the method's utility through late-stage derivatizations of complex bioactive compounds.
- Achieved sequential functionalizations of polyhaloarenes, highlighting the method's versatility.
Conclusions:
- The developed Pd/NBE catalytic system effectively functionalizes aryl chlorides, overcoming previous substrate limitations.
- This methodology significantly expands the scope of arene functionalization via Pd/NBE catalysis.
- The approach offers a valuable tool for synthesizing complex organic molecules and in medicinal chemistry.
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