Metal-free visible-light-mediated organophotoredox catalysis: synthesis of 3-functionalized indole via C–C, C–N bond formation

A visible-light-mediated, mild and one-pot three-component reaction in the presence of organophotoredox catalyst Eosin Y using EtOH:H 2 O as reaction medium for the synthesis of 3-functionalized indole derivatives was developed. Visible light used in the protocol is green, inexpensive, readily available energy source. The sustainable reagents make the protocol compatible with green chemistry demands. Graphic Abstract