Volume 58, Issue 33 pp. 11444-11448
Communication

Pd/PC-Phos-Catalyzed Enantioselective Intermolecular Denitrogenative Cyclization of Benzotriazoles with Allenes and N-Allenamides

Pei-Chao Zhang

Pei-Chao Zhang

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 P. R. China

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Jie Han

Jie Han

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 P. R. China

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Prof. Dr. Junliang Zhang

Corresponding Author

Prof. Dr. Junliang Zhang

Shanghai Key Laboratory of Green Chemistry and Chemical Processes, School of Chemistry and Molecular Engineering, East China Normal University, Shanghai, 200062 P. R. China

Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438 P. R. China

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First published: 13 June 2019
Citations: 89

Graphical Abstract

The first example of an enantioselective denitrogenative cyclization of benzotriazoles with allenes and N-allenamides is enabled using Pd/PC-Phos catalysis, and provides rapid access to optically active 3-methyleneindolines in good yields with high ee values. The method features a general substrate scope, high regioselectivity, and mild reaction conditions. Tf=trifluoromethanesulfonyl.

Abstract

Reported herein is an asymmetric Pd/PC-Phos-catalyzed denitrogenative cyclization of benzotriazoles with allenes and N-allenamides, representing the first example of enantioselective denitrogenative cyclizations of benzotriazoles. A series of optically active 3-methyleneindolines were obtained in good yields with high ee values. The use of inexpensive and readily available starting materials, high regio- and enantioselectivity, a broad substrate scope, mild reaction conditions, no need for base, as well as versatile functionalization of the 3-methyleneindolines make this approach attractive.

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