Volume 53, Issue 48 pp. 13098-13101
Communication

Catalytic Asymmetric Functionalization of Aromatic CH Bonds by Electrophilic Trapping of Metal-Carbene-Induced Zwitterionic Intermediates

Shikun Jia

Shikun Jia

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)

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Dr. Dong Xing

Corresponding Author

Dr. Dong Xing

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)Search for more papers by this author
Dan Zhang

Dan Zhang

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)

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Prof. Dr. Wenhao Hu

Corresponding Author

Prof. Dr. Wenhao Hu

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)

Shanghai Engineering Research Center of Molecular Therapeutics and New Drug Development; Department of Chemistry, East China Normal University, 3663, North Zhongshan Road, Shanghai, 200062 (China)Search for more papers by this author
First published: 04 September 2014
Citations: 154

We are grateful for financial support from NSF of China (20932003 and 21125209), the MOST of China (2011CB808600) and STCSM (12JC1403800).

Graphical Abstract

Caught in a trap: The title reaction of N,N-disubstituted anilines with diazo compounds and imines is reported for the efficient construction of α,α-diaryl benzylic quaternary stereocenters in good yields with high diastereoselectivities and excellent enantioselectivities. Efficient electrophilic trapping of the metal-carbene-induced zwitterionic intermediate is crucial for the enantiocontrol under RhII/chiral phosphoric acid (PPA) co-catalysis.

Abstract

Asymmetric functionalization of aromatic CH bonds of N,N-disubstituted anilines with diazo compounds and imines is reported for the efficient construction of α,α-diaryl benzylic quaternary stereocenters in good yields with high diastereoselectivities and excellent enantioselectivities. This RhII/chiral phosphoric acid cocatalyzed transformation is proposed to proceed through a metal-carbene-induced zwitterionic intermediate which undergoes electrophilic trapping. To the best of our knowledge, this is the first asymmetric example of metal carbene-induced intermolecular functionalization of aryl CH bonds.

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