Electroreductive amination of carboxylic acids by cobalt catalysis

Area of Science:

• Organic Chemistry
• Catalysis
• Electrochemistry

Background:

• Catalytic reduction of carboxylic acids is crucial for biomass conversion and organic synthesis.
• Existing methods often require harsh conditions, flammable hydrogen gas, or sensitive reagents.

Purpose of the Study:

• To develop an efficient and sustainable electrocatalytic method for the reductive coupling of carboxylic acids with amines.
• To utilize protons as the hydrogen source, avoiding hazardous reagents.

Main Methods:

• Employed an earth-abundant cobalt complex as a catalyst for electrocatalytic hydrogenation.
• Utilized protons from the reaction medium as the hydrogen source.
• Investigated the formation of a cobalt-hydride intermediate as the active species.

Main Results:

• Achieved efficient and sustainable electrocatalytic hydrogenation of carboxylic acids with amines and nitroarenes.
• Produced a wide range of structurally diverse complex alkylamines under mild conditions.
• Demonstrated the protocol's utility in isotope labeling using deuterium sources.

Conclusions:

• The developed cobalt-catalyzed electrocatalytic system offers a practical and versatile approach for reductive amination.
• This method provides a safer and more sustainable alternative to conventional hydrogenation techniques.
• The protocol is applicable to the synthesis of valuable chemicals and isotope-labeled compounds.