Synthesis, in vitro antiplatelet activity and molecular modelling studies of 10-substituted 2-(1-piperazinyl)pyrimido[1,2- a ]benzimidazol-4(10 H )-ones
                                
                                    
                                        作者:Mario Di Braccio、Giancarlo Grossi、Maria Grazia Signorello、Giuliana Leoncini、Elena Cichero、Paola Fossa、Silvana Alfei、Gianluca Damonte                                    
                                    
                                        DOI:10.1016/j.ejmech.2013.01.026
                                    
                                    
                                        日期:2013.4
                                    
                                    The multistep preparation of the new 10-substituted 2-(1-piperazinyl)pyrimido[1,2-a]benzimidazol-4(10H)-ones 6a-o, and of the two isomers 10-ethyl-2-(diethylamino)pyrimido[1,2-a]benzimidazol-4(10H)-one 6p and 10-ethyl-4-(diethylamino)pyrimido[1,2-a]benzimidazol-2(10H)-one 13, as well as the in vitro evaluation of their inhibitory activity on human platelet aggregation induced in platelet-rich plasma by ADP, collagen or the Ca2+ ionophore A23187 were here described. Nine out of fifteen 2-(1-piperazinyl)derivatives (6g-o) showed good inhibitory properties towards all the platelet aggregation agonists used. Moreover, a molecular modelling study has been performed on two of the best compounds of this series (6i and 6o) to confirm in silico their interactions with the catalytic site of human platelet PDE3, using the X-ray data of the PDE3B isoform in complex with an inhibitor. (C) 2013 Elsevier Masson SAS. All rights reserved.