Volume 135, Issue 8 e202217496
Zuschrift

Diethylzinc-Mediated Cross-Coupling Reactions between Dibromoketones and Monobromo Carbonyl Compounds

Aika Takeshima

Aika Takeshima

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588 Japan

Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo, Kyoto, 606-8502 Japan

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Prof. Dr. Taichi Kano

Corresponding Author

Prof. Dr. Taichi Kano

Department of Applied Chemistry, Graduate School of Engineering, Tokyo University of Agriculture and Technology, Koganei, Tokyo, 184-8588 Japan

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First published: 30 December 2022

Abstract

A novel route to synthesize 1,4-dicarbonyl compounds is described. α,α-Dibromoketones generate zinc enolates through a diethylzinc-mediated halogen-metal exchange and react with α-bromocarbonyl compounds to furnish 1,4-dicarbonyl compounds via a second generation of zinc enolates. This cross-coupling reaction is enabled by the chemoselective formation of zinc enolates from α,α-dibromoketones in the presence of α-bromocarbonyl compounds. Chiral 1,4-dicarbonyl compounds can be obtained via the enantioselective bromination of aldehydes using a chiral secondary amine catalyst and a subsequent cross-coupling reaction between the resulting chiral α-bromoaldehydes and α,α-dibromoacetophenones.

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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