Electroreductive Cross-Coupling Reactions: Carboxylation, Deuteration, and Alkylation

Area of Science:

• Electrochemistry and Organic Synthesis
• Catalysis and Reaction Mechanisms
• Sustainable Chemistry and Green Processes

Background:

• Electrochemistry offers precise control over redox potentials for challenging organic transformations.
• Reductive coupling reactions are vital for C-C and C-X bond formation but face limitations like stoichiometric reagents and substrate activation.
• Merging electrochemistry with reductive coupling presents a promising strategy to address these synthetic challenges.

Purpose of the Study:

• To develop novel electroreductive cross-coupling reactions for synthesizing high value-added organic products.
• To establish versatile electrochemical strategies that overcome limitations of traditional reduction methods.
• To explore efficient and selective methods for constructing complex organic molecules using readily available substrates.

Main Methods:

• Development of three distinct electrochemical modes: Electrochemical Direct Reduction (EDR), Electrochemical Organo-mediated Reduction (EOMR), and Electrochemical Metal-catalyzed Reduction (EMCR).
• Application of these methods for carboxylation of halides and arenes using CO2, deuteration of various organic compounds using D2O, and alkylation of alkyl halides.
• Utilizing organic halides, alkenes, arenes, CO2, and D2O as readily available substrates.

Main Results:

• Successful electroreductive carboxylation of aryl/alkyl halides and styrenes, and direct carboxylation of arenes/epoxides with CO2.
• Efficient and selective electroreductive deuteration of arenes, olefins, and alkyl halides, yielding D-labeled products.
• Development of electrochemical alkylation reactions for efficient C(sp3)-C(sp3) bond formation using alkyl halides.

Conclusions:

• The developed electroreductive strategies offer powerful reducing capacity and precise selectivity control for organic synthesis.
• These methods provide sustainable and efficient alternatives to traditional synthetic approaches, minimizing waste and enabling complex molecule construction.
• The versatility of the electrochemical modes allows for broad applicability in synthesizing diverse high-value organic products.