Antimycobacterial activities of 5-alkyl (or halo)-3′-substituted pyrimidine nucleoside analogs

Several 5-alkyl (or halo)-3′-azido (amino or halo) analogs of pyrimidine nucleosides have been synthesized and evaluated against Mycobacterium bovis, Mycobacterium tuberculosis and Mycobacterium avium. Among these compounds, 3′-azido-5-ethyl-2′,3′-dideoxyuridine (3) was found to have significant antimycobacterial activities against M. bovis (MIC50 = 1 μg/mL), M. tuberculosis (MIC50 = 10 μg/mL) and M. avium (MIC50 = 10 μg/mL).