A Structure−Affinity Relationship Study on Derivatives of <i>N</i>-[2-[4-(4-Chlorophenyl)piperazin-1-yl]ethyl]-3-methoxybenzamide, a High-Affinity and Selective D<sub>4</sub> Receptor Ligand
作者:Roberto Perrone、Francesco Berardi、Nicola A. Colabufo、Marcello Leopoldo、Vincenzo Tortorella
DOI:10.1021/jm991138z
日期:2000.1.1
N-[2-[4-(4-Chlorophenyl)piperazin-1-yl]ethyl]-3-methoxybenzamide (1), a high-affinity and selective dopamine D-4 receptor ligand, was chosen as a lead, and structural modifications were done on its amide bond and on its alkyl chain linking the benzamide moiety to the piperazine ring and by preparing some semirigid analogues. The binding profile at dopamine D-4 and dopamine D-2, serotonin 5-HT1A, and adrenergic ar receptors of 16 new compounds was determined. From the results emerged that the modification of the amide bond and the elongation of the intermediate alkyl chain caused a decrease in dopamine D-4 receptor affinity. All prepared semirigid analogues displayed D-4 receptor affinity values in the same range of the opened counterparts.