Preparation of piperazine derivatives as 5-HT7 receptor antagonists

Abstract

Twenty-four compounds of 4-methoxy-N-[3-(4-substituted phenyl-piperazine-1-yl) propyl] benzene sulfonamides and N-[3-(4- substituted phenyl-piperazine-1-yl) propyl] naphthyl sulfonamides were prepared and evaluated as 5-HT7 receptor antagonists. Most of the compounds showed the IC50 values of 12-580 nM. Four methyl branched analogues were also obtained, but the activity for methyl branched analogues was almost same as its straight chain congeners. Among the synthesized compounds, 3c showed a good activity on 5-HT7 receptors and a good selectivity on 5-HT1a, 5-HT2a, 5-HT2c, and 5-HT6 receptors. (C) 2008 Elsevier Ltd. All rights reserved.