Synthesis of 3‐Arylquinoxalin‐2(1H)‐ones under Visible‐Light Irradiation with Oxygen‐Doped Carbon Nitride as Heterogenous Photocatalyst

Abstract

A novel oxygen‐doped graphitic carbon nitride (OCN) material was designed and synthesized via the hydrothermal‐calcination method with melamine and hydroperoxide as starting materials. The OCN material was utilized as a highly efficient solid metal‐free photocatalyst for the synthesis of 3‐arylquinoxalin‐2(1H)‐ones via the catalytic decomposition of aryl diazonium salts under blue light irradiation. Following this approach, various 3‐arylquinoxalin‐2(1H)‐one derivatives could be obtained in moderate to excellent yields with broad substrate scope under mild conditions. Also, the OCN solid photocatalyst shows good recyclability in the reaction, there was no appreciable loss in yields observed even after 5 cycles. This methodology offers a practical, mild, and metal‐free alternative to the preparation of 3‐arylquinoxalin‐2(1H)‐ones.

Efficient Visible Light Active Photocatalyst: Magnesium Oxide-Doped Graphitic Carbon Nitride for the Knoevenagel Condensation Reaction

“…This improvement can be attributed to the increased electron diffusion mobility within MgO@g-C 3 N 4 , which facilitates faster and more efficient interfacial charge carrier transfer, which is crucial for effective photocatalysis. These results highlight the enhanced electronic properties of MgO@g-C 3 N 4 , providing further support for its superior photocatalytic performance. − …”

Graphitic carbon nitride (g-C3N4) as an emerging photocatalyst for sustainable environmental applications: a comprehensive review

“…This approach not only provides a novel, environmentally friendly, and easily recyclable pathway but also signifies a sustainable synthetic strategy for generating these valuable structural entities. 88…”

Paired Electrolysis-Enabled Arylation of Quinoxalin-2(1H)-ones

“…Consequently, over the past years, various efforts have been made to develop radical C–H arylations of quinoxalin-2­(1 H )-ones. The exploration of effective arylation reagents has been a central focus in this research field, with five types of arylation reagents (Scheme a) having been developed so far: (1) arylboronic acids, (2) arylhydrazine hydrochlorides, (3) dibenzoyl peroxides, (4) diaryliodonium salts, and (5) aryldiazonium salts . Despite the good efficiency of arylation reagents in most transformations, all of these arylation reactions require thermal- or photoactivation and potentially environmentally unfriendly oxidants/initiators.…”