Arene- and quinoline-sulfonamides as novel 5-HT7 receptor ligands

Novel arene- and quinolinesulfonamides were synthesized using different solutions and a solid-support methodology, and were evaluated for their affinity for 5-HT1A, 5-HT2A, 5-HT6, and 5-HT7 receptors. Compound 54 (N-Ethyl-N-[4-(1,2,3,4,4a,5,6,7,8,8a-decahydroisoquinolin-2-yl)butyl]-8-quinolinesulfonamide) was identified as potent 5-HT7 antagonist (Ki = 13 nM, KB = 140 nM) with good selectivity over 5-HT1A, 5-HT2A, 5-HT6 receptors. In the FST in mice, it reduced immobility in a manner similar to the selective 5-HT7 antagonist SB-269970.