On the basis of a preliminary study of the antimycobacterial activity
of thiobenzanilides, a group of 3'-fluoro- and 4'-fluorothiobenzanilid
es has been synthesized and tested against Mycobacterium tuberculosis,
M. kansasii, M. avium and M. fortuitum. The results of this study dem
onstrate that electron withdrawing groups increase the activity of thi
obenzanilides and fluoro benzothioanilides against atypical strains wh
ich is higher then that of INH.