Synthesis of N-acridinyl-N′-alkylguanidines: Dramatic influence of amine to guanidine replacement on the physicochemical properties
                                
                                    
                                        作者:Walid Zeghida、Julien Debray、Carine Michel、Anne Milet、Pascal Dumy、Martine Demeunynck                                    
                                    
                                        DOI:10.1016/j.bmcl.2008.07.100
                                    
                                    
                                        日期:2008.9
                                    
                                    Transformation of aminoacridines into N-acridinyl-N'-alkylguanidines is described. The chosen procedure allows introduction of pendent substituents (exemplified by N,N-dimethylaminopropyl chain) into key acridinyl thioureas, thus opening the way to structural diversity. Spectroscopic study and pK(a) determination show that the presence of the strongly basic guanidine has a dramatic influence on the ionization of the acridine nucleus by lowering the pk(a) value down to 4.49. (C) 2008 Elsevier Ltd. All rights reserved.