Volume 55, Issue 40 pp. 12228-12232
Communication

Asymmetric Ring Opening/Cyclization/Retro-Mannich Reaction of Cyclopropyl Ketones with Aryl 1,2-Diamines for the Synthesis of Benzimidazole Derivatives

Yong Xia

Yong Xia

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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Dr. Lili Lin

Dr. Lili Lin

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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Fenzhen Chang

Fenzhen Chang

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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Yuting Liao

Yuting Liao

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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Prof. Dr. Xiaohua Liu

Corresponding Author

Prof. Dr. Xiaohua Liu

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

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Prof. Dr. Xiaoming Feng

Corresponding Author

Prof. Dr. Xiaoming Feng

Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064 China

Collaborative Innovation Center of Chemical Science and Engineering, Tianjin, China

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First published: 04 July 2016
Citations: 94

Graphical Abstract

Scandalous Sc: The title reaction proceeds in the presence of a chiral N,N′-dioxide/ScIII catalyst. A variety of benzimidazoles bearing chiral side chains were obtained with excellent results. This method provides novel access to chiral benzimidazole-substituted amide and cycloheptene derivatives.

Abstract

A highly efficient asymmetric ring-opening/cyclization/retro-Mannich reaction of cyclopropyl ketones with aryl 1,2-diamines has been realized using a chiral N,N′-dioxide/ScIII catalyst. Benzimidazoles containing chiral side chains were generated under mild reaction conditions in excellent outcomes (up to 99 % yield and 97 % ee). This method also provides efficient access to chiral benzimidazole-substituted amide and cycloheptene derivatives.

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