Volume 61, Issue 45 e202210624
Research Article

Regio- and Diastereoselective Formal [2+2] Cycloaddition of Allenes with Amino-Functionalized Alkenes by Rare-Earth-Catalyzed C(sp2)−H Activation

Wenxuan Xu

Wenxuan Xu

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152–8552 Japan

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Dr. Xuefeng Cong

Corresponding Author

Dr. Xuefeng Cong

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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Dr. Kun An

Dr. Kun An

Organometallic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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Dr. Shao-Jie Lou

Dr. Shao-Jie Lou

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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Zhenghua Li

Zhenghua Li

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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Dr. Masayoshi Nishiura

Dr. Masayoshi Nishiura

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

Organometallic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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Prof. Dr. Tetsuro Murahashi

Prof. Dr. Tetsuro Murahashi

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152–8552 Japan

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Prof. Dr. Zhaomin Hou

Corresponding Author

Prof. Dr. Zhaomin Hou

Advanced Catalysis Research Group, RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, O-okayama, Meguro-ku, Tokyo 152–8552 Japan

Organometallic Chemistry Laboratory, RIKEN Cluster for Pioneering Research, 2-1 Hirosawa, Wako, Saitama 351–0198 Japan

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First published: 19 September 2022
Citations: 25

Graphical Abstract

Half-sandwich rare-earth catalysts serve as a unique platform for the regio- and diastereoselective formal [2+2] cycloaddition of a wide range of allenes with amino-functionalized alkenes via allene C(sp2)−H activation, affording a new family of cyclobutane and cyclobutene derivatives which were difficult to access previously.

Abstract

The [2+2] cycloaddition of allenes with alkenes is of much interest and importance as a straightforward route for the construction of four-membered carbocycles but has remained much underexplored to date. Herein we report for the first time the intermolecular regio- and diastereoselective formal [2+2] cycloaddition of a wide range of allenes with amino-functionalized alkenes by half-sandwich rare-earth catalysts. The reaction proceeded through an allene C(sp2)−H activation mechanism initiated by the site-selective deprotonation of the allene unit by a rare-earth metal alkyl species followed by alkene insertion into the resulting metal-allenyl bond and the subsequent intramolecular cycloaddition to an allene C=C bond. This protocol offers a unique route for the synthesis of a new family of cyclobutane and cyclobutene derivatives which were difficult to access previously.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article.

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