Antimicrobial activity of new benzazolyl N-sulfonyl amidines

The reactions of N-(benz[d]oxazol-2-yl)- or N-(benzo[d]-thiazol-2-yl)-substituted carbothioamides with sulfonyl azides proceed as replacement of thioxo substituent by the sulfonylimino group to afford the corresponding N'-sulfonylated amidines. Acetic acid thioamides react smoothly upon boiling in ethanol, while for thioamides of trifluoroacetic and benzoic acids heating to 80–90 °C was required. Among hybrid molecules thus prepared, bacteriostatic-, bactericidal- and fungistatic-active against S. aureus and C. albicans representatives were found.