Investigation of platelet aggregation inhibitory activity by phenyl amides and esters of piperidinecarboxylic acids
作者:Modesto de Candia、Luciana Summo、Antonio Carrieri、Cosimo Altomare、Adele Nardecchia、Saverio Cellamare、Angelo Carotti
DOI:10.1016/s0968-0896(02)00599-0
日期:2003.4
A series of anilides and phenyl esters of piperidine-3-carboxylic acid (nipecotic acid) were synthesized and tested for the ability to inhibit aggregation of human platelet rich-plasma triggered by adenosine 5'-diphosphate (ADP) and adrenaline. As a rule, amides were about two times more active than the corresponding esters, and derivatives bearing substituents at the para position of the phenyl ring were significantly more active than the meta-substituted ones. Among the tested compounds, 4-hexyloxyanilide of nipecotic acid (18a) was found to be the most active one, its IC50 value being close to that of the most active bis-3-carbamoyl-piperidines reported in literature (ca. 40 muM) and aspirin (ca. 60 muM) in ADP- and adrenaline-induced aggregation, respectively. Compared with the isomeric 4-hexyloxyanilides of piperidine-2-carboxylic (pipecolinic) and piperidine-4-carboxylic (isonipecotic) acids, compound 18a showed higher activity, and a Hansch-type quantitative structure-activity relationship (QSAR) study highlighted lipophilicity and increase in electron density of the phenyl ring as the properties which mainly increase the antiplatelet activity (r(2) = 0.74, q(2) = 0.64). The interaction of nipecotoyl anilides with phosphatidylinositol, a major component of the inner layer of the platelet membranes, was investigated by means of flexible docking calculation methods to give an account of a key event underlying their biological action. (C) 2003 Elsevier Science Ltd. All rights reserved.