

With an aim of creating new, high affinity dopaminergic ligands, six different 3- and 4-substituted 1-{2-[5-(1H-benzimidazole-2-thione)]ethyl}piperidines and nine related heterocyclic congeners were synthesized and evaluated for in vitro binding affinity at D1 and D2 dopamine receptors. Synaptosomal membranes prepared from fresh bovine caudate nuclei were used as a source of the dopamine receptors. Only 4-[bis-(4-fluorophenyl)methylene]-piperidines, compounds 9e, 10d, and 11d, expressed moderate affinity for the D1 receptors, while all other compounds were inactive competitors of [3H]SCH 23390. Compounds 9c, 9d, 10c, 11a, and 11c were inactive in the D2 receptor binding assay, as well. Derivatives of 4-phenylpiperidine (9-11b) and 3-phenyl-piperidine (10a) expressed a moderate to low affinity for the D2 receptors. However, racemic (±)-1-{2-[5-(1H-benzimidazole-2-thione)]ethyl}-3-phenylpiperidine 9a and its enantiomer (+)-9a behaved as selective, high affinity D2 receptor ligands, the latter being some four times more active than the racemate.
| EMTREE drug terms: | 1 [2 [5 (1h benzimidazole 2 thione)ethyl] 3 phenyl]piperidine8 chloro 2,3,4,5 tetrahydro 3 methyl 5 phenyl 1h 3 benzazepin 7 ol hydrogen maleatedopamine 2 receptorhaloperidolpiperidine derivativeunclassified drugdopamine 1 receptordopamine 2 receptordopamine receptor stimulating agentpiperidine derivative |
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| EMTREE medical terms: | animal tissuearticlecattlecaudate nucleuscontrolled studydopaminergic systemdrug receptor bindingin vitro studynonhumanpriority journalreaction analysissynaptosomeanimalmetabolismradioassaysynthesis |
| MeSH: | AnimalsCattleDopamine AgentsPiperidinesRadioligand AssayReceptors, Dopamine D1Receptors, Dopamine D2 |
Dopamine Agents; Piperidines; Receptors, Dopamine D1; Receptors, Dopamine D2
Dukic, S.; Institute for Biological Research, 29. Novembra 142, Yugoslavia
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