Novel 1-(2-aminoethyl)-3-(arylsulfonyl)-1H-indoles were prepared. Binding assays indicated they are 5-HT6 receptor ligands, among which N, N-dimethyl-N-{2-[3-(1-naphthylsulfonyl)- 1H-indol-1-yl] ethyl} amine 8t and N-methyl-N-{2-[3-(1-naphthylsulfonyl)-1H-indol-1-yl] ethyl} amine 8u showed high affinity for 5-HT6 receptors with Ki= 3.7 and 5.7 nM, respectively.