作者:Gianni Sagratini、Michela Buccioni、Ugo Gulini、Gabriella Marucci、Carlo Melchiorre、Amedeo Leonardi、Rodolfo Testa、Dario Giardina
DOI:10.1007/s00044-004-0024-8
日期:2004.4
The prazosin-related compound (+)-cyclazosin [(+)-1] is an (alpha(1)-adrenoceptor antagonist with moderate selectivity for the alpha(1b)-adrenoceptor subtype (selectivity ratio: alpha(1b)/alpha(1a)= 90, alpha(1b)/alpha(1d) = 24). To improve its pharmacological profile, the novel chiral derivatives (+)-2-(+)5, bearing a bromo, a methyl, a methoxy or an acetyl group in position 5 of the 2-furoyl moiety, were synthesized and evaluated for their alpha(1)-adrenoceptor blocking activity. All the compounds displayed, like (+)-1, high and preferential affinity for the alpha(1b)-adrenoceptor in binding and 4 functional assays. Interestingly, in functional assays, compounds (+)-3 and (+)-4 showed, in comparison with (+)-1, an increase in the alpha(1B)/alpha(1A) selectivity (407 and 724 vs. 44), whereas compound (+)-5 exhibited an improved alpha(1B)/alpha(1D) selectivity (1513 vs. 138).