Acid-Mediated Oxidative C-H Phosphorylation of Quinoxalines and Quinoxalin-2(1H)-one

Abstract

Quinoxaline is a chemical moiety known for its diverse physicochemical and biological properties, making it the focus of extensive research. Over the past few decades, quinoxaline scaffolds have been utilized in the design and development of various bioactive molecules, dyes, fluorescent materials, electroluminescent materials, organic sensitizers for solar cells, and polymeric optoelectronic materials. Herein, we present a metal-free and rapid protocol for the phosphorylation of quinoxalines and quinoxalin-2(1H)-one. This method employs oxygen as an oxidant under ambient temperature and atmospheric pressure, with experimental evidence indicating the absence of radical involvement. Our methodology provides range of phosphorylated quinoxalines and quinoxaline-2(1H)-one in yields ranging from 47% to 99%.