Uranyl-Enabled Photocatalytic C(sp³)-H Functionalization with Azoles.

Area of Science:

• Organic Chemistry
• Catalysis
• Green Chemistry

Background:

• C(sp3)-center/azole bond formation is crucial in synthesizing pharmaceuticals and functional materials.
• Existing methods often require harsh conditions, expensive catalysts, or external additives.

Purpose of the Study:

• To develop a novel, efficient, and green catalytic system for C(sp3)-center/azole coupling.
• To investigate the reaction mechanism and explore the industrial applicability of the developed method.

Main Methods:

• Catalytic coupling reaction using uranyl nitrate under mild conditions.
• Broad substrate scope evaluation.
• Sunlight-driven and scale-up experiments.
• Experimental and theoretical mechanistic studies (hydrogen-atom transfer and concerted proton-electron transfer).

Main Results:

• Uranyl nitrate effectively catalyzed C(sp3)-center/azole coupling with broad substrate scope and high yields (up to 95%).
• The reaction proceeded efficiently under mild conditions without external additives.
• Successful validation under sunlight and in scale-up experiments confirmed industrial potential.
• Mechanistic studies elucidated the dual catalytic roles of uranyl nitrate via HAT and non-HAT pathways.

Conclusions:

• A green and efficient protocol for C(sp3)-azole bond formation was established using uranyl nitrate catalysis.
• The method's mild conditions, high yields, and industrial potential make it a valuable addition to synthetic organic chemistry.
• Understanding the reaction mechanism provides insights for designing future catalytic systems.