5-halo-tryptamine Derivatives Used As Ligands On The 5-ht6 And/or 5-ht7 Serotonin Receptors

Compounds of Formula (I): (I); wherein: R1 and R2 either the same or different, are H or linear or branched C1–C6 alkyl; R3=linear or branched C1–C6 alkyl; R4=halogen, and pharmaceutically acceptable salts thereof are useful as active ingredients in the preparation of medicaments used as ligands of the 5-HT6 and/or 5-HT7 serotoninergic receptors.