CuBr2@g-C3N4-catalyzed cyclization of aromatic alkyne ketones to obtain indenones with K2S2O8 under blue light irradiation

Abstract

We developed a new scheme of preparing indenones by cyclization of aromatic alkyne ketones based on an admixture of photocatalysts CuBr2@g-C3N4. Also, benzoylindenone was obtained in the yield of 95.2% under blue light at room temperature. By screening the experimental conditions, the mechanism of CuBr2@g-C3N4 catalyzed aryl cyclization was the formation of cyclic 1H-inden-1-one compounds by the generation of transfer electrons excited under blue light. According to the goal of sustainable development of green chemistry, an economical method for preparing indenone from aromatic alkyne ketone was proposed by our team.