Studies on Novel Pyridine and 2-pyridone Derivatives of N-arylpiperazine as α-adrenoceptor Ligands
Marzena Baran, Elzbieta Kepczynska, Marek Zylewski, Agata Siwek, Marek Bednarski and Marek Tadeusz Cegla
Affiliation: Faculty of Pharmacy, Jagiellonian University Medical College, Medyczna 9, 30-688 Krakow, Poland.
Keywords: α-adrenoceptor ligands, N-arylpiperazine derivatives, lipophilicity, pyridine, 2-pyridone.
This paper describes the synthesis of a series of new N-arylpiperazine derivatives of pyridine and 2-pyridone.
The in vitro pharmacological study indicated that all of the compounds possess affinity towards α1-adrenoceptors, with
exception of 6d, and are selective over α2 receptor. The most potent compound 5f displayed 62-fold α2/α1 selectivity with
Ki value of 27.3 nM for α1 receptor. Selectivity of other ligands ranged from 6 to more than 146-fold. Hydrochlorides of
selected compounds with the best α1-adrenoceptor affinity (7b, 7e, 7f, 8b) were tested in vivo (hypotensive activity test in
rats) and the results proved their α-adrenoreceptor antagonistic activity. Furthermore, the lipophilicity of the investigated
compounds has been assessed experimentally and in silico.
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