Volume 60, Issue 35 pp. 19030-19034
Communication

Photoredox-Catalyst-Enabled para-Selective Trifluoromethylation of tert-Butyl Arylcarbamates

Yaqiqi Jiang

Yaqiqi Jiang

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

These authors contributed equally to this work.

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Bao Li

Bao Li

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

These authors contributed equally to this work.

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Nana Ma

Nana Ma

Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Sai Shu

Sai Shu

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Yujie Chen

Yujie Chen

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Shan Yang

Shan Yang

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Zhibin Huang

Zhibin Huang

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Prof. Dr. Daqing Shi

Corresponding Author

Prof. Dr. Daqing Shi

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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Prof. Dr. Yingsheng Zhao

Corresponding Author

Prof. Dr. Yingsheng Zhao

Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123 P. R. China

School of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453000 P. R. China

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First published: 23 June 2021
Citations: 16

Graphical Abstract

We report a light-promoted 4,5-dichlorofluorescein (DCFS)-enabled para-selective C−H trifluoromethylation of arylcarbamates using the Langlois reagent. Arylcarbamates, including the bioactive compound chlorzoxazone, vorinostat precursor, chlorpropham, and teriflunomide precursors, were suitable for this reaction, leading to the formation of the corresponding products in moderate to good yields.

Abstract

The direct incorporation of a trifluoromethyl group on an aromatic ring using a radical pathway has been extensively investigated. However, the direct highly para-selective C−H trifluoromethylation of a class of arenes has not been achieved. In this study, we report a light-promoted 4,5-dichlorofluorescein (DCFS)-enabled para-selective C−H trifluoromethylation of arylcarbamates using Langlois reagent. The preliminary mechanistic study revealed that the activated organic photocatalyst coordinated with the arylcarbamate led to para-selective C−H trifluoromethylation. Ten-gram scale reaction performs well highlighting the synthetic importance of this new protocol.

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