Synthesis and antileishmanial evaluation of 1-aryl-4-(4,5-dihydro-1H-imidazol-2-yl)-1H-pyrazole derivatives
                                
                                    
                                        作者:Maurício S. dos Santos、Mariana L.V. Oliveira、Alice M.R. Bernardino、Rosa M. de Léo、Veronica F. Amaral、Flavia T. de Carvalho、Leonor L. Leon、Marilene M. Canto-Cavalheiro                                    
                                    
                                        DOI:10.1016/j.bmcl.2011.09.134
                                    
                                    
                                        日期:2011.12
                                    
                                    A series of 1-aryl-4-(4,5-dihydro-1H-imidazol-2-yl)-1H-pyrazoles (4a-g) and 5-amino-1-aryl-4-(4,5-dihydro-1H-imidazol-2-yl)-1H-pyrazoles (5a-g) were synthesized and evaluated in vitro against three Leishmania species: L. amazonensis, L. braziliensis and L. infantum (L. chagasi syn.). The cytotoxicity was assessed. Among the derivatives examined, six compounds emerged as the most active on promastigotes forms of L. amazonensis with IC50 values ranging from 15 to 60 mu M. The reference drug pentamidine presented IC50 = 10 mu M. However, these new compounds were less cytotoxic than pentamidine. Based on these results, the more promising derivative 5d was tested further in vivo. This compound showed inhibition of the progression of cutaneous lesions in CBA mice infected with L. amazonensis relative to an untreated control. (C) 2011 Elsevier Ltd. All rights reserved.