Volume 61, Issue 1 e202111860
Research Article
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Rhodium-Catalyzed Atroposelective Access to Axially Chiral Olefins via C−H Bond Activation and Directing Group Migration

Ruijie Mi

Ruijie Mi

School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, 710062 China

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Haohua Chen

Haohua Chen

School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400030 China

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Dr. Xukai Zhou

Dr. Xukai Zhou

Department of Chemistry, The University of Chicago, Chicago, IL, 60637 USA

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Prof. Dr. Nan Li

Prof. Dr. Nan Li

School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, 710062 China

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Danqing Ji

Danqing Ji

School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, 710062 China

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Dr. Fen Wang

Corresponding Author

Dr. Fen Wang

School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, 710062 China

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Prof. Dr. Yu Lan

Prof. Dr. Yu Lan

School of Chemistry and Chemical Engineering, Chongqing University, Chongqing, 400030 China

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Prof. Dr. Xingwei Li

Corresponding Author

Prof. Dr. Xingwei Li

School of Chemistry and Chemical Engineering, Shaanxi Normal University (SNNU), Xi'an, 710062 China

Institute of Molecular Science and Engineering, Institute of Frontier and Interdisciplinary Sciences, Shandong University, Qingdao, 266237 China

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First published: 22 October 2021
Citations: 103

Graphical Abstract

Two classes of tetrasubstituted axially chiral olefins have been accessed in excellent enantioselectivity via RhIII-catalyzed asymmetric C−H activation assisted by a migratable directing group.

Abstract

Axially chiral open-chain olefins represent an underexplored class of chiral platform. In this report, two classes of tetrasubstituted axially chiral acyclic olefins have been accessed in excellent enantioselectivity and regioselectivity via C−H activation of (hetero)arenes assisted by a migratable directing group en route to coupling with sterically hindered alkynes. The coupling of indoles bearing an N-aminocarbonyl directing group afforded C–N axially chiral acrylamides with the assistance of a racemic zinc carboxylate additive. DFT studies suggest a β-nitrogen elimination–reinsertion pathway for the directing group migration. Meanwhile, the employment of N-phenoxycarboxamide delivered C−C axially chiral enamides via migration of the oxidizing directing group. Experiments suggest that in both cases the (hetero)arene substrate adopts a well-defined orientation during the C−H activation, which in turn determines the disposition of the alkyne in migratory insertion. Synthetic applications of representative chiral olefins are demonstrated.

Conflict of interest

The authors declare no conflict of interest.

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