Acridine Yellow G-catalyzed Visible-Light-Promoted Synthesis of 2-amino-4 H-chromene Scaffolds via a Photo-Induced Electron Transfer Process in an Aqueous Media

By employing the Knoevenagel–Michael tandem cyclocondensation of malononitrile, aldehydes, and resorcinol, we developed a green method for the radical synthesis of 2-amino-4 H-chromene scaffolds. A photo-induced electron transfer (PET) photocatalyst was employed in an aqueous solution to use visible light as a renewable energy source. This study aims to develop a non-metal dye that is inexpensive and easily accessible. In addition to having speed-saving features and being simple to use, the photochemically catalyzed AYG demonstrates high yields, energy efficiency, and environmental friendliness. This makes it possible to track changes in chemical and environmental variables throughout time. It is amazing that gram-scale cyclization is practical, proving that it has industrial applications.