Enantioselective Pd-Catalysed Nucleophilic C(sp3)-H (Radio)fluorination.
Nikita Chekshin1, Luo-Yan Liu1, D Quang Phan1
1Department of Chemistry, The Scripps Research Institute; 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.
Researchers developed a novel palladium-catalyzed method for enantioselective C-H fluorination of amides and lactams. This breakthrough enables the synthesis of valuable chiral fluorinated compounds and facilitates 18F-radiolabelling for drug discovery.
Area of Science:
- Organic Chemistry
- Catalysis
- Medicinal Chemistry
Background:
- Chiral fluorinated organic molecules are in high demand for pharmaceuticals.
- Enantioselective C-H fluorination, especially using nucleophilic fluorine sources, is a significant synthetic challenge.
- Existing methods lack enantioselective nucleophilic fluorination of inert C(sp3)-H bonds.
Purpose of the Study:
- To develop a catalytic system for highly regio- and enantioselective nucleophilic C-H fluorination.
- To enable the synthesis of chiral fluorinated amides and lactams.
- To apply the method for late-stage 18F-radiolabelling.
Main Methods:
- Design and development of a palladium-based catalytic system with bifunctional MPASA ligands.
- Application of the catalyst for nucleophilic beta-C(sp3)-H fluorination of amides and lactams.
- Mechanistic studies to elucidate the C-F bond formation pathway.
Main Results:
- Achieved highly regio- and enantioselective nucleophilic beta-C(sp3)-H fluorination of amides and lactams.
- Demonstrated rapid conversion of fluorinated products to chiral amines and ketones.
- Successfully applied the method for late-stage 18F-radiolabelling of pharmaceutical derivatives using [18F]KF.
Conclusions:
- The developed Pd-catalyst system with MPASA ligands is effective for enantioselective nucleophilic C-H fluorination.
- This method provides access to valuable chiral fluorinated building blocks for medicinal chemistry.
- The approach is suitable for 18F-radiolabelling, aiding in drug development and imaging.
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