title: Structure-activity relationship studies of CNS agents, Part 31: Analogs of MP 3022 with a different number of nitrogen atoms in the heteroaromatic fragment--new 5-HT1A receptor ligands.
abstract: Two series of new MP 3022 analogs, i.e. 1-(o-methoxyphenyl)-4-n-propylpiperazines (3, 4a, 4b, 6-9, and 12-13) and 2-(n-propyl)-1,2,3,4-tetrahydroisoquinolines (5a, 5b, 11a, and 11b) containing a terminal heteroaromatic system with a different number of nitrogen atoms, were synthesized and their 5-HT1A/5-HT2A and alpha 1 receptor affinity was assayed. The majority of investigated piperazines may be classified as non-selective 5-HT1A/5-HT2A/alpha 1 receptor ligands. Compounds 3, 4a, 4b, 7-9a with the highest affinity for 5-HT1A receptors (Ki = 4-54 nM) were tested in vivo. Their functional activity was differentiated; while 3, 8, and 9a behaved like weak antagonists of postsynaptic 5-HT1A receptors, 4b and 7 may be classified as potential partial 5-HT1A receptors, agonists. Isomer 4a has characteristic features of a potential weak postsynaptic 5-HT1A receptor agonist.
authors.affiliation: Institute of Pharmacology, Polish Academy of Sciences, Kraków, Poland.
authors.forename: M H
authors.initials: MH
authors.lastname: Paluchowska
authors.forename: A
authors.initials: A
authors.lastname: Dereń-Wesołek
authors.forename: J L
authors.initials: JL
authors.lastname: Mokrosz
authors.forename: S
authors.initials: S
authors.lastname: Charakchieva-Minol
authors.forename: E
authors.initials: E
authors.lastname: Chojnacka-Wójcik
mesh_terms: D000818:Animals; D007546:Isoquinolines / Q000138:chemical synthesis* / Q000378:metabolism / Q000494:pharmacology*; D008024:Ligands; D008297:Male; D009584:Nitrogen / Q000737:chemistry*; D010879:Piperazines / Q000138:chemical synthesis* / Q000378:metabolism / Q000494:pharmacology*; D051381:Rats; D017208:Rats, Wistar; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000378:metabolism*; D044263:Receptors, Serotonin, 5-HT1; D012702:Serotonin Antagonists / Q000138:chemical synthesis* / Q000494:pharmacology*; D017366:Serotonin Receptor Agonists / Q000138:chemical synthesis* / Q000378:metabolism / Q000494:pharmacology*; D013329:Structure-Activity Relationship; D014230:Triazoles / Q000494:pharmacology
chemical_list: D007546:Isoquinolines; D008024:Ligands; D010879:Piperazines; D011985:Receptors, Serotonin; D044263:Receptors, Serotonin, 5-HT1; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists; D014230:Triazoles; C088974:4-(3-(benzotriazol-1-yl)propyl)-1-(2-methoxyphenyl)piperazine; D009584:Nitrogen