Synthesis and pharmacological evaluation of aryl/heteroaryl piperazinyl alkyl benzotriazoles as ligands for some serotonin and dopamine receptor subtypes.
Thirteen [(aryl/heteroaryl-piperazinyl)alkyl]benzotriazoles were prepared as potential trazodone- and buspirone-like drugs. The synthesized compounds displayed from moderate to good affinity to the serotonin 5-HT1A receptor and only modest or poor affinity to the dopamine D2 receptor, similar to buspirone. The introduction of substituents on the benzotriazole ring did not improve the affinity to the 5-HT1A receptor, compared to the previously described unsubstituted derivatives. In a general pharmacological screening, which concerned only three of these compounds so far (5, 7 and 13), several in vitro and in vivo activities were observed. The guinea pig ileum contractions, induced either electrically or by several agonists, were strongly inhibited; at higher concentrations also the spontaneous tone of the guinea pig trachea was reduced. Compound 13 exhibited good analgesic activity in mice in the formalin-induced algesia and in the writhing test. The same at 30 mg kg(-1) p.o. also displayed antihypertensive activity probably related to calcium channel blockade and adrenergic alpha1 antagonism. In binding assays, 13 showed a IC50 = 580 nM for displacing [3H]prazosin from alpha1 receptor. Finally, compound 5 (and, to a minor extent, compound 13) protected mice against potassium cyanide induced hypoxia.
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Dipartimento di Scienze Farmaceutiche, Università di Genova, Italy.
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D000818:Animals; D000959:Antihypertensive Agents / Q000494:pharmacology; D001522:Behavior, Animal / Q000187:drug effects; D015259:Dopamine Agents / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D006339:Heart Rate / Q000187:drug effects; D006439:Hemodynamics / Q000187:drug effects; D007202:Indicators and Reagents; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D010147:Pain Measurement / Q000187:drug effects; D010879:Piperazines / Q000138:chemical synthesis* / Q000494:pharmacology*; D011954:Receptors, Dopamine / Q000187:drug effects* / Q000378:metabolism; D011985:Receptors, Serotonin / Q000187:drug effects* / Q000378:metabolism; D018490:Serotonin Agents / Q000138:chemical synthesis* / Q000494:pharmacology / Q000633:toxicity; D014230:Triazoles / Q000138:chemical synthesis* / Q000494:pharmacology*
D000959:Antihypertensive Agents; D015259:Dopamine Agents; D007202:Indicators and Reagents; D008024:Ligands; D010879:Piperazines; D011954:Receptors, Dopamine; D011985:Receptors, Serotonin; D018490:Serotonin Agents; D014230:Triazoles