Résumé/Abstract New imidazo [1, 2-a] pyridine and imidazo [1, 2-a] pyrimidine derivatives were easily obtained by an one-pot synthesis that implies the reaction of the corresponding 2-aminoheterocycles with N, N-dimethylfomiamide dimethylacetal (DMFDMA), followed by the reaction of intermediate N-heteroarylformamidine (without isolation) with reactive α- halocarbonyl compounds. In this way, new 3-substituted imidazol 1, 2-a] pyridine and ...