Abstract
A series of (E)-2-(4-cinnamylpiperazin-1-yl)-N-(1-substituted-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)acetamides were synthesized and evaluated for their positive inotropic activity by measuring the left atrium stroke volume on isolated rabbit heart preparations. This class of compounds presented favorable in vitro activity compared with the standard drug, milrinone, among which N-(1-(3-chlorophenyl)-4,5-dihydro-[1,2,4]triazolo[4,3-a]quinolin-7-yl)-2-(4-cinnamylpiperazin-1-yl)acetamide 5e was found to be the most potent with 16.58 ± 0.11% increased stroke volume (milrinone: 2.46 ± 0.07%) at a concentration of 3 × 10(-5) M. The chronotropic effects of the compounds having inotropic effects were also evaluated.
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