Volume 136, Issue 31 e202405782
Zuschrift

H8-BINOL-Derived Chiral η6-Benzene Ligands: New Opportunities for the Ruthenium-Catalyzed Asymmetric C−H Activation

Junxuan Li

Junxuan Li

School of Chemistry, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

These authors contributed equally to this work.

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Guodong Wang

Guodong Wang

School of Chemistry, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

These authors contributed equally to this work.

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Weicong Guo

Weicong Guo

School of Chemistry, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Jijun Jiang

Jijun Jiang

School of Chemistry, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Prof. Dr. Jun Wang

Corresponding Author

Prof. Dr. Jun Wang

School of Chemistry, Key Laboratory of Bioinorganic and Synthetic Chemistry of Ministry of Education, and Guangdong Key Laboratory of Chiral Molecule and Drug Discovery, Sun Yat-Sen University, Guangzhou, 510006 P. R. China

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Celebrating the 100th Anniversary of Sun Yat-Sen University and of Its School of Chemistry
First published: 28 April 2024

Abstract

Given the tremendous success of (p-cymene)RuII-catalyzed C−H activation over the past 20 years, the community has long been aware that the development of chiral η6-benzene (Ben) ligands should be a potent strategy for achieving the attractive but incredibly underdeveloped ruthenium(II)-catalyzed asymmetric C−H activation. However, it has rarely been achieved due to the severe difficulty in developing proper chiral Ben ligands. In particular, designing chiral Ben ligands by connecting a benzene fragment to a chiral framework including benzene rings remained an unsolved challenge until this effort. Here we present a novel class of axially chiral Ben ligands derived from readily available (S)-5,5′,6,6′,7,7′,8,8′-octahydro-1,1′-bi-2-naphthol ((S)-H8-BINOL) in 4–8 steps. Notably, when coordinated with ruthenium, such chiral Ben ligand containing three benzene rings only forms one of the three possible isomeric BenRuII complexes. The related chiral BenRuII catalysts could effectively catalyze the asymmetric C−H activation of N-sulfonyl ketimines with alkynes, affording a range of chiral spirocyclic sultams in up to 99 % yield with up to >99 % ee. These catalysts are expected to find broad applications in future.

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