Organometallic benzimidazoles: Synthesis, characterization and antimalarial activity

A series of ferrocenyl and cyrhetrenyl benzimidazoles were synthesized and characterized. The condensation-cyclization reaction of cyrhetrenecarbaldehyde with 1,2-phenylendiamine or 4-nitro-1,2-phenylendiamine produces only the 2-cyrhetrenyl-benzimidazoles [1-Re-(H, NO2)] whereas with the same diamines, ferrocenecarbaldehyde yields two products: 2-ferrocenyl-benzimidazole [1-Fe-(H, NO2)] and N-ferrocenylmethy1-2-ferrocenylbenzimidazole [2-Fe-(H, NO2)]. The structures of all products were confirmed by H-1, C-13 NMR spectra and MS. The molecular structure of 2-Fe-NO2 was determined by single crystal X-ray analysis. The antimalarial evaluation studies against the CQ susceptible-strain (3D7) and the CQ resistant-strain (W2) of Plasmodium falciparum revealed cyrhetrene conjugates to be most potent of the tested compounds. The presence of the nitro group at the 5-position of organometallic-benzimidazoles [1-M (M = Re, Fe)] also increases the antimalarial activity. (C) 2013 Elsevier B.V. All rights reserved.