Volume 136, Issue 38 e202409332
Forschungsartikel

Axial Ligand Enables Synthesis of Allenylsilane through Dirhodium(II) Catalysis

Wendeng Li

Wendeng Li

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

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Rui Wu

Rui Wu

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

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Hao Ruan

Hao Ruan

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

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Bo Xiao

Bo Xiao

Key Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055 P. R. China

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Xiang Gao

Xiang Gao

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

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Prof. Dr. Huanfeng Jiang

Prof. Dr. Huanfeng Jiang

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

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Dr. Kai Chen

Dr. Kai Chen

College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083 P. R. China

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Dr. Tian-Yu Sun

Corresponding Author

Dr. Tian-Yu Sun

Key Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, School of Chemical Biology and Biotechnology, Peking University Shenzhen Graduate School, Shenzhen, 518055 P. R. China

Institute of Molecular Chemical Biology, Shenzhen Bay Laboratory, Shenzhen, 518132 P. R. China

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Prof. Dr. Shifa Zhu

Corresponding Author

Prof. Dr. Shifa Zhu

Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640 P. R. China

School of Chemistry and Chemical Engineering, Zhejiang Sci-Tech University, Hangzhou, 310018 P. R. China

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First published: 18 June 2024
Citations: 1

Abstract

Described herein is a dirhodium(II)-catalyzed silylation of propargyl esters with hydrosilanes, using tertiary amines as axial ligands. By adopting this strategy, a range of versatile and useful allenylsilanes can be achieved with good yields. This reaction not only represents a SN2′-type silylation of the propargyl derivatives bearing a terminal alkyne moiety to synthesize allenylsilanes from simple hydrosilanes, but also represents a new application of dirhodium(II) complexes in catalytic transformation of carbon-carbon triple bond. The highly functionalized allenylsilanes that are produced can be transformed into a series of synthetically useful organic molecules. In this reaction, an intriguing ON-OFF effect of the amine ligand was observed. The reaction almost did not occur (OFF) without addition of Lewis base amine ligand. However, the reaction took place smoothly (ON) after addition of only catalytic amount of amine ligand. Detailed mechanistic studies and density functional theory (DFT) calculations indicate that the reactivity can be delicately improved by the use of tertiary amine. The fine-tuning effect of the tertiary amine is crucial in the formation of the Rh−Si species via a concerted metalation deprotonation (CMD) mechanism and facilitating β-oxygen elimination.

Conflict of Interests

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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