Volume 57, Issue 52 pp. 17151-17155
Communication

Pd-Catalyzed Atroposelective C−H Allylation through β-O Elimination: Diverse Synthesis of Axially Chiral Biaryls

Gang Liao

Gang Liao

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

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Bing Li

Bing Li

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

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Hao-Ming Chen

Hao-Ming Chen

School of Chemical & Environmental Engineering, Wuyi University, Jiangmen, 529020 China

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Qi-Jun Yao

Qi-Jun Yao

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

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Yu-Nong Xia

Yu-Nong Xia

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

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Jun Luo

Jun Luo

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

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Prof. Dr. Bing-Feng Shi

Corresponding Author

Prof. Dr. Bing-Feng Shi

Department of Chemistry, Zhejiang University, Hangzhou, 310027 China

State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin, 300071 China

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First published: 09 November 2018
Citations: 180

Graphical Abstract

A Pd-catalyzed atroposelective C−H allylation with allylic surrogates is reported. tert-Leucine was identified as an efficient catalytic transient chiral auxiliary. A range of enantioenriched biaryls were prepared in synthetically useful yields with enantioselectivities up to >99 % ee through β-O elimination. The reaction could be scaled up and the products could be further converted into enantiomerically pure axially chiral carboxylic acids.

Abstract

Biaryl atropisomers are of great importance in natural products, pharmaceuticals, and asymmteric synthesis. The efficient synthesis of these chiral scaffolds with full enantiocontrol and high diversity remains challenging. Reported herein is a Pd-catalyzed atroposelective C−H allylation with tert-leucine as an efficient catalytic chiral transient auxiliary. A wide range of enantioenriched biaryl aldehydes were prepared in synthetically useful yields with excellent enantioselectivity (up to >99 % ee) through β-O elimination. The reaction could be carried out on a gram scale without erosion of the ee value. A variety of axially chiral carboxylic acids could be obtained with high enantiopurity. The resulting axially chiral biaryl aldehydes and carboxylic acids might be used in asymmetric synthesis as chiral ligands and/or organocatalysts.

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