Redox Neutral Radical-Relay Nickel-Catalyzed Remote Carbonylation

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• Carbonyl group installation is crucial in organic synthesis.
• Existing methods for α-substituted ketone synthesis often require harsh conditions or lack selectivity.
• Remote functionalization strategies are highly sought after for efficient molecular construction.

Purpose of the Study:

• To develop a novel and efficient method for catalytic carbonyl group installation.
• To achieve α-substituted ketone synthesis via remote radical coupling.
• To establish a reaction with broad functional-group compatibility and high site-selectivity.

Main Methods:

• Nickel-catalyzed reaction employing sequential single-electron transfer and 1,5-hydrogen atom transfer.
• Remote radical coupling mechanism for carbonyl insertion.
• Optimization of reaction conditions including pressure and redox environment.

Main Results:

• Successful catalytic installation of a carbonyl group at the remote position.
• Formation of α-substituted ketones with high yields and selectivity.
• Demonstration of functional-group tolerance under mild, redox-neutral conditions.

Conclusions:

• The developed nickel-catalyzed method offers an efficient and selective route to α-substituted ketones.
• The reaction proceeds via a unique remote radical coupling pathway.
• This methodology expands the toolkit for strategic carbonyl group introduction in complex molecules.