title: New selective and potent 5-HT(1B/1D) antagonists: chemistry and pharmacological evaluation of N-piperazinylphenyl biphenylcarboxamides and biphenylsulfonamides.
abstract: A series of new analogues of N-[4-methoxy-3-(4-methylpiperazin-1-yl)phenyl] 2'-methyl-4'-(5-methyl-1,2,4-oxadiazol-3-yl)biphenyl-4-carboxamide (1; GR127935) as potent and selective 5-HT(1B/1D) antagonists were synthesized and evaluated pharmacologically. Their receptor binding profiles were comparable to that of 1. The 1,3,4-oxadiazole isomer 2 and the 4'-aminocarbonyl and 4'-amidinyl analogues (9 and 10) of 1 had higher affinities at the rat 5-HT(1B) receptor (IC(50) = 0.93, 1. 3, and 0.5 nM, respectively) and calf 5-HT(1D) receptor (IC(50) = 37, 10, and 3 nM, respectively) than did 1 (1.6 and 52 nM for rat 5-HT(1B) and calf 5-HT(1D) receptors, respectively). In the functional in vitro testing of 5-HT(1B/1D) antagonistic properties, 2, 9, 10, 11b (O-demethylated derivative of 2), 13a (O-methylsulfonyl analogue of 2), and 16 (which differs from 2 with a sulfonamide linker) showed more pronounced effects in the K(+)-induced 5-HT release in the cortex of guinea pig than did 1 and 3 (SB224289). Compounds 2, 9, and 10 were equally potent as 1 in rabbit saphenous vein model (pA(2) > 9). A biochemical study of 2 with in vivo microdialysis in the rat brain showed that it is capable of augmenting citalopram (a selective serotonin reuptake inhibitor, SSRI) induced 5-HT release in rat ventral hippocampus, while preventing the decrease in acetylcholine release elicited by citalopram administration. The molecular structure of 2 was determined by single-crystal X-ray analysis. The log P and log D values of these compounds were calculated. This study contributes to the SAR study of N-piperazinylphenyl biphenylcarboxamides as selective and potent 5-HT(1B/1D) antagonists.
authors.affiliation: Department of Medicinal Chemistry, University of Groningen, A. Deusinglaan 1, NL-9713 AV Groningen, The Netherlands. y.liao@farm.rug.nl
authors.forename: Y
authors.initials: Y
authors.lastname: Liao
authors.forename: H
authors.initials: H
authors.lastname: Böttcher
authors.forename: J
authors.initials: J
authors.lastname: Harting
authors.forename: H
authors.initials: H
authors.lastname: Greiner
authors.forename: C
authors.initials: C
authors.lastname: van Amsterdam
authors.forename: T
authors.initials: T
authors.lastname: Cremers
authors.forename: S
authors.initials: S
authors.lastname: Sundell
authors.forename: J
authors.initials: J
authors.lastname: März
authors.forename: W
authors.initials: W
authors.lastname: Rautenberg
authors.forename: H
authors.initials: H
authors.lastname: Wikström
mesh_terms: D000109:Acetylcholine / Q000378:metabolism; D000818:Animals; D001713:Biphenyl Compounds / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D002417:Cattle; D018360:Crystallography, X-Ray; D006168:Guinea Pigs; D006624:Hippocampus / Q000378:metabolism; D066298:In Vitro Techniques; D008297:Male; D017551:Microdialysis; D015394:Molecular Structure; D009119:Muscle Contraction / Q000187:drug effects; D009131:Muscle, Smooth, Vascular / Q000187:drug effects / Q000502:physiology; D010879:Piperazines / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D011817:Rabbits; D011869:Radioligand Assay; D051381:Rats; D017208:Rats, Wistar; D044302:Receptor, Serotonin, 5-HT1B; D044346:Receptor, Serotonin, 5-HT1D; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000378:metabolism; D012501:Saphenous Vein / Q000187:drug effects / Q000502:physiology; D012701:Serotonin / Q000378:metabolism; D012702:Serotonin Antagonists / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology; D013329:Structure-Activity Relationship; D013449:Sulfonamides / Q000138:chemical synthesis* / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology
chemical_list: D001713:Biphenyl Compounds; D010879:Piperazines; D044302:Receptor, Serotonin, 5-HT1B; D044346:Receptor, Serotonin, 5-HT1D; D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D013449:Sulfonamides; D012701:Serotonin; D000109:Acetylcholine