Electrochemical Bisarylation of Carbonyls: A Direct Synthetic Strategy for Bis(indolyl)methane

An interesting electrochemical direct bisarylation of carbonyls with indole derivatives to afford the corresponding bis(indolyl)methane (BIM) derivatives is described. The developed protocol is suitable for aliphatic, aromatic, and heteroaromatic aldehydes, which react with various electron-rich and electron-poor indoles to afford the corresponding BIMs in good to excellent yields. Isatin derivatives also underwent bisarylation with various indole derivatives under the influence of current to afford the corresponding BIMs in excellent yields.