ABSTRACT
Treatment of tuberculosis [TB] and the discovery of effective new anti tubercular drugs is one of the most urgent priorities in health organizations all around the world. In the present study, fluorinated analogs of some of the most important anti-TB agents such as p-aminosalicylic acid [PAS], thiacetazone and pyrazinamide were synthesized and tested against TB. The fluorinated analog of thiacetazone was 20 times more potent than the parent compound against M.tuberculosis H37-RV, while the fluorinated PAS was almost three times less potent than PAS. A few other halogenated analogs of thioacetazone were also synthesized and subjected to anti-TB screening tests. The best halogen substituent was found to be fluorine which has the smallest size from one hand and the strongest electronegativity from the other hand among the halogen atoms. This fact reemphasizes the unique nature of fluorine as a golden substituent in medicinal chemistry