A series of 143 salicylanilides substituted in positions 4 and 5 and in positions 3' and 4' was synthesized. The compounds were evaluated for in vitro antimycobacterial activity against Mycobacterium tuberculosis, Mycobacterium kansasii, and Mycobacterium avium. To describe the structure-antimycobacterial activity relationships (QSARs), an approach based on the combination of the Free-Wilson and Hansch methods was employed (the substituent constants were used in the case of the substituents on the phenyl ring; indicator parameters were used for the substituents on the acyl moiety). The relationships between the antimycobacterial activity and physico-chemical parameters of all substituents were also explored. The quadratic representation of lipophilicity parameters did not lead to significant correlations.

Department of Inorganic and Organic Chemistry Faculty of Pharmacy Heyrovského 1203 CZ 500 05 Hradec Králové Czech Republic

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