A method for synthesis without protecting groups of bis(indolyl)methanes by the (η-benzyl)palladium system generated from a palladium catalyst and benzyl alcohol in water is developed. This domino protocol involves C3–H bond activation/benzylation of indole–carboxylic acids and benzylic C–H functionalization. Mechanistic studies indicate that the (η-benzyl)palladium(II) complex, which is formed...
