The synthesis of 2-(3-(4-(dimethylamino)phenyl)-2-oxoindolin-3-yl)-1H-indene-1,3(2H)-diones as new unsymmetrical oxindolesvia a Friedel-Crafts type three-componentreaction of 1,3-indandion, N,N-dimethylaniline and isatins in ethanol in the presence of LiClO4 is reported.