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Published on: November 9, 2019
Atroposelective Diverse Remote meta-C-H Functionalization via Kinetic Resolution
Jian-Jun Li1, Xiao-Xuan Zeng1, Xin Kuang1
1State Key Laboratory of Organometallic Chemistry and Shanghai-Hong Kong Joint Laboratory in Chemical Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, CAS 345 Lingling Road, Shanghai 200032, P. R. China.
This study introduces a novel method for creating chiral molecules with meta-functionalized biaryl scaffolds using palladium catalysis and kinetic resolution. This breakthrough enables the synthesis of complex atropisomers for pharmaceuticals and materials science.
Area of Science:
- Organic Chemistry
- Catalysis
- Asymmetric Synthesis
Background:
- Chiral biaryl scaffolds are crucial in pharmaceuticals and ligands.
- Atroposelective functionalization at the meta-position of biaryls is challenging.
Purpose of the Study:
- To develop a novel method for atroposelective meta-C-H functionalization.
- To synthesize enantioenriched meta-functionalized biaryl products, particularly quinoline derivatives.
Main Methods:
- Utilized palladium(II)-catalyzed enantioselective C-H activation.
- Employed a chiral monoprotected amino acid (MPAA) ligand and a racemic transient norbornene mediator.
- Initiated reaction with enantioselective ortho-C-H activation via kinetic resolution, followed by a Catellani relay.
Main Results:
- Achieved rare atroposelective remote meta-C-H functionalization.
- Synthesized diverse enantioenriched quinoline-based atropisomers with high stereoselectivity (S-factors up to 458).
- Demonstrated unprecedented enantioselective meta-alkenylation and alkynylation.
Conclusions:
- The developed method provides efficient access to valuable chiral meta-functionalized biaryl scaffolds.
- The synthesized compounds have potential applications in pharmaceuticals, chiral ligands, and functional materials.
- Showcased synthetic utility through the creation of novel P,N-ligands and chiral materials with CPL activity.
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