A series of N‐(2‐hydroxyethyl)‐1,2‐benzisothiazol‐3(2H)‐one and ‐thione carbamicesters have been synthesised and tested against Mycobacterium avium strains. The MIC values determined by the radiometric broth dilution method were between 2 and 8 μg/mL for the benzisothiazolthione derivatives and between 16 and 32 μg/mL or higher for the corresponding benzisothiazolone derivatives.
N-Hydroxyalkyl derivatives of 1,2-benzisothiazol-3(2H)-one and 1,2-benzisothiazol-3(2H)-thione have been prepared and their antifungal and antibacterial activity evaluated. Several compounds were active against selected fungi and Gram-positive microorganisms. Interesting activity was observed against the anaerobic strain Clostridium perfringens. Generally the more active compounds belong to the class of 1,2-benzisothiazol-3(2H)-ones. The retardation matches R(M) of the compounds was also evaluated but the results obtained show that lipophilicity has only a minor effect on the antimicrobial activity.