[2-(2,4-Dihydroxyphenyl)-1,3,4-thiadiazole analogues: antifungal activity in vitro against Candida species].

The antifungal activity in vitro of the newly synthesized and previously reported compounds of 5-substituted 2-(2,4-dihydroxyphenyl)-1,3,4-thiadiazole series was evaluated. Their structures were confirmed by elemental analyses and IR, 1H and 13C NMR and mass spectra. The azole-resistant clinical isolates of C. albicans and nonalbicans Candida spp. were used in the antifungal tests. Some compounds exhibit higher activities than the comparatively studied antifungal drugs. 2-Amino-1,3,4-thiadiazole derivatives exhibited higher (than other analogues) antifungal effects against Candida nonalbicans spp. than against C. alhicans. Derivatives with strong antifungal activity have a narrow range of lipophilicity values determined by the Villar approach.