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Chiral Binaphthyldimethyl η6-Benzene Ligands: Design, Synthesis, and Application in Ruthenium-Catalyzed Asymmetric
Xiaoman Mai1, Huan Liu1, Jijun Jiang1
1Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, School of Chemistry, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-sen University, Guangzhou 510006, People's Republic of China.
Researchers developed novel chiral binaphthyldimethyl benzene (Ben) ligands for ruthenium (Ru) catalysts. This breakthrough enables highly efficient asymmetric C-H activation, creating complex chiral spirocyclic compounds with excellent yields and enantioselectivity.
Area of Science:
- Organometallic Chemistry
- Asymmetric Catalysis
- Synthetic Organic Chemistry
Background:
- Chiral eta(6)-benzene (Ben) metal catalysts are crucial for asymmetric catalysis.
- Developing effective chiral Ben ligands remains a significant challenge in the field.
- Previous chiral BenRu(II) catalysts showed promise but required improvement.
Purpose of the Study:
- To design and synthesize a novel class of chiral Ben ligands: binaphthyldimethyl Ben ligands.
- To develop highly efficient chiral BenRu(II) catalysts for asymmetric synthesis.
- To achieve facile access to diverse chiral spirocyclic compounds with all-carbon quaternary stereocenters.
Main Methods:
- Synthesis of novel binaphthyldimethyl Ben ligands.
- Site-specific coordination of Ben ligands to ruthenium (Ru).
- Phenol-directed asymmetric C-H activation of 1-aryl-2-naphthols with alkynes.
Main Results:
- Successfully prepared novel chiral BenRu(II) catalysts.
- Achieved highly efficient phenol-directed asymmetric C-H activation.
- Produced diverse chiral spirocyclic compounds in high yields (up to 99%) and excellent enantioselectivity (up to 97% ee).
- Demonstrated superior performance compared to earlier chiral BenRu(II) catalysts.
Conclusions:
- The novel binaphthyldimethyl Ben ligands enable the development of highly effective chiral BenRu(II) catalysts.
- This catalytic system provides a facile route to valuable chiral spirocyclic compounds.
- The findings represent a significant advancement in asymmetric catalysis using chiral Ben metal complexes.
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