Synthesis and pharmacological evaluation of several N-(2-nitrophenyl) piperazine derivatives

Six newly synthesized heterocyclic (2-nitrophenyl)piperazines, with a specific structure of the heteroaryl group, whichmimics the catechol moiety of dopamine (benzimidazoles and substituted benzimidazoles), were evaluated for their binding affinity to rat dopamine (DA), serotonin (5-HT) and _1 receptors. All compounds with a benzimidazole group had a 5-HT2A/D2 receptors binding ratio characteristic for atypical neuroleptics (>1, pK i values). Compound 7c, 4-bromo-6-{2-_4-(2-nitrophenyl)piperazin- 1-yl_ethyl}-1H-benzimidazole, expressed higher affinities for all receptor classes than clozapine. Also, it exhibited the best characteristic for atypical neuroleptics and presents a compound with the best profile for further in vivo investigations.
Sintetisano je šest heterocikličnih (2-nitrofenil)piperazina sa specifičnom heteroaril grupom, koja podražava kateholsku grupu dopamina (benzimidazoli i supstituisani benzimidazoli), i ispitan je njihov afinitet ka dopaminskim, serotoninskim i _1 receptorima. Sva jedinjenja sa benzimidazolskim grupama su pokazala 5-HT 1A/D2 odnos vezivanja karakterističan za atipične neuroleptike (>1, pK i vrednosti). Jedinjenje 7c, 4-bromo-6-{2-_4-(2-nitrofenil)piperazin-1-il_etil}-1H-benzimidazol, pokazalo je izraženiji afinitet ka svim klasama receptora u poređenju sa klozapinom i takođe predstavlja jedinjenje sa najboljim karakteristikama za dalja in vivo istraživanja.