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Transition-metal-catalyst-free electroreductive alkene hydroarylation with aryl halides under visible-light
Kosuke Yamamoto1, Kazuhisa Arita1, Masami Kuriyama1
1Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.
Beilstein Journal of Organic Chemistry
|June 18, 2024
Summary
This study introduces a new electroreductive hydroarylation method for synthesizing linear alkylarenes. This transition-metal-free process uses visible light and a redox mediator, achieving high yields for valuable organic compounds.
Area of Science:
- Organic Chemistry
- Synthetic Methodology
- Electrochemistry
Background:
- Radical hydroarylation is a key method for synthesizing linear alkylarenes.
- Existing methods often require transition metal catalysts and harsh conditions.
Purpose of the Study:
- To develop a novel, efficient, and metal-free electroreductive hydroarylation of alkenes.
- To explore mild reaction conditions for synthesizing alkylarenes from aryl halides and alkenes.
Main Methods:
- Employing electroreductive conditions with visible-light irradiation.
- Utilizing 1,3-dicyanobenzene as a redox mediator.
- Investigating the reaction mechanism through mechanistic studies.
Main Results:
- Achieved efficient hydroarylation of electron-deficient alkenes and styrene derivatives.
- Demonstrated high yields of desired products under transition-metal-catalyst-free conditions.
- Suppressed hydrodehalogenation byproducts through optimized conditions.
Conclusions:
- The developed electroreductive hydroarylation offers a mild and efficient route to linear alkylarenes.
- The use of a redox mediator and visible light is crucial for the reaction's success.
- A reductive radical-polar crossover pathway is proposed to be the key mechanism.
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