Mangana(iii/iv)electro-catalyzed C(sp³)-H azidation.

Area of Science:

• Organic Chemistry
• Catalysis
• Synthetic Methodology

Background:

• C(sp³)-H bond functionalization remains a significant challenge in organic synthesis.
• Developing efficient and selective methods for introducing nitrogen-containing groups is crucial for drug discovery and materials science.

Purpose of the Study:

• To develop a user-friendly, manganese-catalyzed azidation of inert C(sp³)-H bonds.
• To establish a resource-economic and operationally simple strategy for late-stage azidation of bioactive compounds.

Main Methods:

• Manganese-catalyzed electro-catalyzed azidation using sodium azide.
• Mechanistic investigations employing experimental studies, spectrophotometry, and cyclic voltammetry.

Main Results:

• Achieved azidation of otherwise inert C(sp³)-H bonds under mild conditions.
• Demonstrated high functional-group compatibility and chemoselectivity.
• Identified traceless electrons as the sole redox reagent and Earth-abundant manganese as the catalyst.

Conclusions:

• The developed C-H azidation strategy is operationally simple, resource-economic, and avoids directing groups.
• Mechanistic studies support a pathway involving metal-catalyzed aliphatic radical formation and azidyl radical transfer within a manganese(iii/iv) redox cycle.
• This method provides a valuable tool for the late-stage azidation of complex and bioactive molecules.