Volume 135, Issue 2 e202214709
Zuschrift

Synthesis of α-Quaternary β-Lactams via Copper-Catalyzed Enantioconvergent Radical C(sp3)−C(sp2) Cross-Coupling with Organoboronate Esters

Dr. Fu-Li Wang

Dr. Fu-Li Wang

School of Science and Institute of Scientific Research, Great Bay University, Dongguan, 523000 China

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

These authors contributed equally to this work.

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Dr. Lin Liu

Dr. Lin Liu

School of Science and Institute of Scientific Research, Great Bay University, Dongguan, 523000 China

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

These authors contributed equally to this work.

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Dr. Chang-Jiang Yang

Dr. Chang-Jiang Yang

School of Science and Institute of Scientific Research, Great Bay University, Dongguan, 523000 China

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

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Cheng Luan

Cheng Luan

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

Academy for Advanced Interdisciplinary Studies and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055 China

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Dr. Jing Yang

Dr. Jing Yang

College of Health Science and Environmental Engineering, Shenzhen Technology University, Shenzhen, 518118 China

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Dr. Ji-Jun Chen

Dr. Ji-Jun Chen

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

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Dr. Qiang-Shuai Gu

Dr. Qiang-Shuai Gu

Academy for Advanced Interdisciplinary Studies and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055 China

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Dr. Zhong-Liang Li

Corresponding Author

Dr. Zhong-Liang Li

Academy for Advanced Interdisciplinary Studies and Department of Chemistry, Southern University of Science and Technology, Shenzhen, 518055 China

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Prof. Dr. Xin-Yuan Liu

Corresponding Author

Prof. Dr. Xin-Yuan Liu

Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, 518055 China

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Dedicated to Professor Keiji Maruoka on the occasion of his 70th birthday
First published: 10 November 2022
Citations: 1

Abstract

The copper-catalyzed enantioconvergent radical C(sp3)−C(sp2) cross-coupling of tertiary α-bromo-β-lactams with organoboronate esters could provide the synthetically valuable α-quaternary β-lactams. The challenge arises mainly from the construction of sterically congested quaternary stereocenters between the tertiary alkyl radicals and chiral copper(II) species. Herein, we describe our success in achieving such transformations through the utilization of a copper/hemilabile N,N,N-ligand catalyst to forge the sterically congested chiral C(sp3)−C(sp2) bond via a single-electron reduction/transmetalation/bond formation catalytic cycle. The synthetic potential of this approach is shown in the straightforward conversion of the corresponding products into many valuable building blocks. We hope that the developed catalytic cycle would open up new vistas for more enantioconvergent cross-coupling reactions.

Data Availability Statement

The data that support the findings of this study are openly available in Cambridge Crystallographic Data Centre at https://www.ccdc.cam.ac.uk/structures/, reference number 2210247.

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