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, H-1 and C-13 NMR and mass spectra. The azole-resistant clinical isolates of Candida albicans and no-albicans Candida spp. were used in the antifungal tests. Some compounds exhibit higher activities than the comparatively studied antifungal drugs. Amino-1,3,4-thiadiazole derivatives exhibited higher (than other analogues) antifungal effects against Candida no-albicans spp. than against C. albicans. Derivatives with strong antifungal activity have a narrow range of lipophilicity values determined by the Villar approach.