Synthesis and Antimicrobial Activities of New Polyhalogenated Benzimidazoles

A series of new polyhalogenated benzimidazoles has been synthesized and their antibacterial and antiprotozoal activity was evaluated. Several of new substituted halogenobenzimidazoles and their 2′-deoxynucleosides showed noteworthy antiprotozoal toxicity particularly against Giardia lamblia. The most potent agents against bacteria and fungi were 4,5,6,7-tetrachlorobenzimidazoles with polyfluoroalkyl chain at position 2 of the heterocyclus.