7-Arylpiperazinylalkyl and 7-tetrahydroisoquinolinylalkyl derivatives of 8-alkoxy-purine-2,6-dione and some of their purine-2,6,8-trione analogs as 5-HT1A, 5-HT2A, and 5-HT7 serotonin receptor ligands
作者:Grażyna Chłoń-Rzepa、Paweł Żmudzki、Paweł Zajdel、Andrzej J. Bojarski、Beata Duszyńska、Agnieszka Nikiforuk、Ewa Tatarczyńska、Maciej Pawłowski
DOI:10.1016/j.bmc.2007.05.017
日期:2007.8
On the basis of our earlier studies with the serotonin receptor ligands in the group of 1,3-dimetliyl-3,7-dihydropurine-2, 6-dione derivatives. a series of new arylpiperazinylalkyl and tetrahydroisocluinolinylalkyl analogs of 8-alkoxy-1,3-dimethyl-3,7-dihydropurine-2,6-dione (10-25) and 1,3-dimethyl-7,9-dihydro-3H-purine-2,6,8-trione (26-30) were synthesized and their 5-HT1A, 5-HT2A, and 5-HT7 receptor affinities were determined. The new compounds 17, 18, 20, and 21 were found to be highly active 5-HT1A receptor ligands (K-i = 11-19 nM) with diversified affinity for 5-HT2A receptors (K-i = 15-253 nM). Compounds 12, 13, 15, and 19 were moderately potent 5-HT2A ligands (K-i = 23-57 nM), whereas 17, 18, 24, and 25 showed distinct affinity for 5-HT7 receptors (Ki = 51-83 nM). Purine-2,6,8-triones showed weak affinities for 5-HT2A and 5-HT7 receptors; among them, 27 and 29 were classified as 5-HT2A receptor ligands.The selected compounds 17 and 21 were pharmacologically evaluated to determine their functional activities at pre-(hypothermia in mice) and post-(lower lip retraction in rats) synaptic 5-HT1A receptors. Compound 17 showed features of a potential agonist of pre- and post-synaptic 5-HT1A receptors, whereas 21 was classified as a potential, weak partial agonist of postsynaptic sites. Last of all, the most interesting compound 17 tested in behavioral models showed potential anxiolytic and antidepressant activities. (c) 2007 Elsevier Ltd. All rights reserved.