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Synthesis and biological activity of some 2-imidazolinylhydrazone derivatives

Kornicka, A.; Hudson, A.L.; Bednarski, P.J.

Acta Poloniae Pharmaceutica 66(5): 523-534

2009

ISSN/ISBN: 0001-6837
PMID: 19894648
Document Number: 631444
A series of N-(imidazolidin-2-ylidene)hydrazones and N-(4,5-dihydro-1H-imidazol-2-yl)-N-methylhydrazones were prepared and examined for alpha 1-, alpha 2-adrenergic and imidazoline I1, I2 receptors binding affinities as well as cytotoxic activity against human tumor cell lines. Among the compounds tested, 2-naphthaldehyde N-(imidazolidin-2-ylidene)hydrazone (3e) exhibited a significant affinity for both alpha 2-adrenergic and imidazoline I1 receptors (Ki = 94.3 nM and IC50 = 51.7 nM, respectively). Moreover, pyridine-2-carboxaldehyde N-(imidazolidin-2-ylidene)hydrazone (3l) showed the highest binding affinity to alpha 1-adrenoceptors (Ki = 24.6 nM), while quinoline-2-carboxaldehyde N-(imidazolidin-2-ylidene)hydrazone (3m) displayed the highest I2 affinity with a Ki value of 26.7 nM and a high selectivity with respect to alpha 2-adrenergic and imidazoline I1 receptors (Ki = 22470.0 nM and IC50 = 6145.0 nM, respectively). None of the tested N-(4,5-dihydro-1H-imidazol-2-yl)-N-methylhydrazones 4p-u displayed cytotoxic activity.

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