Visible-Light-Induced Radical C-N Coupling for Access to Hydrazine Derivatives

Area of Science:

• Organic Chemistry
• Medicinal Chemistry
• Photochemistry

Background:

• Hydrazine derivatives are crucial building blocks in medicinal chemistry.
• Existing synthetic methods often require harsh conditions or toxic reagents.
• Development of mild and efficient synthetic routes is highly desirable.

Purpose of the Study:

• To develop a facile visible-light-induced radical C-N coupling reaction.
• To synthesize diverse hydrazine derivatives efficiently.
• To provide a sustainable and practical method for preparing nitrogen-containing compounds.

Main Methods:

• Visible-light irradiation of azodicarboxylates and 2,3-dihydroquinazolin-4(1H)-ones.
• Radical C-N coupling reaction conducted at room temperature.
• Absence of external photosensitizers and additives.

Main Results:

• Successful synthesis of hydrazine derivatives with yields ranging from 54% to 99%.
• High substrate and functional group compatibility demonstrated.
• Gram-scale synthesis and subsequent product elaboration confirmed practicality.

Conclusions:

• A mild, environmentally friendly, and efficient method for preparing hydrazines was established.
• The developed protocol offers a valuable route to nitrogen-containing intermediates for drug discovery.
• Radical pathway confirmed through trapping experiments, supporting the reaction mechanism.