Volume 58, Issue 10 pp. 3014-3020
Communication

Design and Catalytic Asymmetric Construction of Axially Chiral 3,3′-Bisindole Skeletons

Chun Ma

Chun Ma

School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 P. R. China

These authors contributed equally to this work.

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Fei Jiang

Fei Jiang

School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 P. R. China

These authors contributed equally to this work.

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Feng-Tao Sheng

Feng-Tao Sheng

School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 P. R. China

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Dr. Yinchun Jiao

Dr. Yinchun Jiao

School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, 411201 P. R. China

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Dr. Guang-Jian Mei

Dr. Guang-Jian Mei

School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 P. R. China

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Prof. Dr. Feng Shi

Corresponding Author

Prof. Dr. Feng Shi

School of Chemistry and Materials Science, Jiangsu Normal University, Xuzhou, 221116 P. R. China

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First published: 20 November 2018
Citations: 256

Graphical Abstract

Bulk up: The first catalytic asymmetric construction of 3,3′-bisindole skeletons bearing axial and central chirality has been established by organocatalytic asymmetric addition reactions of 2-substituted 3,3′-bisindoles with electrophiles. This reaction also represents the first highly enantioselective construction of axially chiral 3,3′-bisindole skeletons, and utilizes the strategy of introducing a bulky group to the ortho-position of prochiral 3,3′-bisindoles.

Abstract

The first catalytic asymmetric construction of 3,3′-bisindole skeletons bearing both axial and central chirality has been established by organocatalytic asymmetric addition reactions of 2-substituted 3,3′-bisindoles with 3-indolylmethanols (up to 98 % yield, all >95:5 d.r., >99 % ee). This reaction also represents the first highly enantioselective construction of axially chiral 3,3′-bisindole skeletons, and utilizes the strategy of introducing a bulky group to the ortho-position of prochiral 3,3′-bisindoles. This reaction not only provides a good example for simultaneously controlling axial and central chirality in one operation, but also serves as a new strategy for catalytic enantioselective construction of axially chiral 3,3′-bisindole backbones from prochiral substrates.

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