Research Progress on the Formation of C-C Bonds through Photoinduced Cross-coupling Reactions Involving Katritzky Salts

Abstract: In recent years, photochemical organic conversion promoted by visible light has attracted the interest of many organic chemists. Compared with the traditional methods, visible light as the photocatalytic oxidation of renewable energy has been proved to be a mild and powerful tool that can promote the activation of organic molecules through the single electron transfer (SET) process. Katritzky salt has been widely used in organic synthesis and drug preparation due to its convenient synthesis, easy availability of raw materials and high stability. These large Katritzky salts derived from amines can easily generate carbon radicals and conduct various organic conversion reactions. At present, this research has become an important research field of organic synthesis. This paper reviews the research results of coupling reactions of Carbon- Carbon bond formation involving visible light promoted Katritzky salts since 2020, and discusses representative examples and reaction mechanisms.