Electrochemical TEMPO-Catalyzed Oxidative Ugi-Type Reaction

Area of Science:

• Organic Chemistry
• Green Chemistry
• Synthetic Methodology

Background:

• Oxidative isocyanide-based multicomponent reactions (oxidative IMCRs) are valuable for rapid molecular diversity construction.
• Current oxidative IMCRs are limited to three components due to challenges in chemoselectivity with more reactants.

Purpose of the Study:

• To develop the first oxidative Ugi-type four-component reaction (4-IMCR).
• To overcome chemoselectivity challenges in multicomponent reactions with increased complexity.

Main Methods:

• Utilized a mild and green TEMPO-catalyzed electro-oxidation process.
• Employed alcohols as surrogates for aldehydes.
• Conducted the reaction in the absence of supporting electrolytes.

Main Results:

• Achieved the first successful oxidative Ugi-type 4-IMCR.
• Demonstrated high chemoselectivity in the presence of amines.
• Showcased compatibility with diverse alcohols, amines, isocyanides, and carboxylic acids.

Conclusions:

• The developed method expands the scope of oxidative IMCRs to four components.
• This green electro-oxidation strategy offers a versatile platform for synthesizing complex molecules efficiently.