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Abstract: On the basis of the active site of lanosterol 14α-demethylase from Candida albicans (CACYP51), a series of 1-(2-(2,4-difluorophenyl)-2-hydroxy-3-(1H-1,2,4-triazol-1-yl)propyl)-1H-1,2,4-triazol-5(4H)-one derivatives were synthesized as fluconazole analogs. Results of the preliminary antifungal tests against eight human pathogenic fungi in vitro showed that these compounds exhibited activities to some extent, and some displayed excellent antifungal activities against C. albicans than reference drug fluconazole. Flexible molecular docking was used to analyze the structure–activity relationships (SARs) of the target compounds. The designed compounds interact with CACYP51 through hydrophobic, van der Waals and hydrogen-bonding interactions. [Copyright &y& Elsevier]

Abstract: A series of novel 1,2,4-triazole derivatives with a 4-(4-substitutedphenyl) piperazine side chain were designed and synthesized based on the structure of lanosterol 14α-demethylase (CYP51). Their antifungal activities against eight human pathogenic fungi were evaluated in vitro by measuring the minimal inhibitory concentrations. Nearly all tested compounds were found to be more potent against Candida albicans than control drug fluconazole. Noticeably, the MIC80 value of compounds 6,7,9,14 and 29 is 16 times lower than that of voriconazole against C. albicans. The activities of compounds 7 and 21 against Cryptococcus neoformans in vitro are comparable to that of voriconazole with a MIC80 value of 0.0156 μg/mL. Moreover, the molecular model for the binding between compound 7 and the active site of CACYP51 was provided based on the computational docking results. [Copyright &y& Elsevier]

Abstract: In order to search for many target compounds with excellent activities, a series of 1-(1H-1,2,4-triazol-1-yl)-2-(2,4-difluoro-phenyl)-3-[(4-substituted phenyl)-piperazin-1-yl]-propan-2-ols were designed, synthesized, and evaluated as antifungal agents. Results of preliminary antifungal tests against eight human pathogenic fungi in vitro showed that all the title compounds exhibited excellent activities with broad spectrum. Moreover, a molecular model for the binding between 5a and the active site of CACYP51 was provided based on the computational docking results. [ABSTRACT FROM AUTHOR]

Abstract: A series of 1-(1H-1,2,4-triazol-1-yl)-2-(2,4-difluorophenyl)-3-substituted-2-propanols (1a–v, 2a–w), which are analogues of fluconazole, have been designed and synthesized as the potential antifungal agents by the click reaction. Click reaction approach toward the synthesis of two sets of novel 1,2,3-triazolyl linked triazole antifungal derivatives 1a–v, 2a–w was achieved by Cu(I)-catalyzed 1,3-dipolar cycloaddition of propargylated intermediate 8 with substituted azidomethyl benzene. The 1,2,3-triazolyl group was inserted into the side chain of the target molecule which can increase the antifungal activity of compounds. [Copyright &y& Elsevier]

Abstract: Based on the results of computational docking to the active site of the cytochrome P450 14α-demethylase (CYP51), a series of 1-(1H-1,2,4-triazole-1-yl)-2-(2,4-difluorophenyl)-3-substituted-2-propanols as analogs of fluconazole were designed, synthesized, and evaluated as antifungal agents. The MIC80 values indicate that compounds 1a–n exhibited higher activity against nearly all fungi tested except Aspergillus fumigatus than fluconazole, while compounds 2a–f, 3a–f showed no activity or only moderate activity against all fungi tested. Noticeably, the MIC value of compounds 1a, 1b and 1g is 64 times lower than that of fluconazole against Microsporum gypseum in vitro. And compounds 1a, 1b and 2b showed 128 times higher activity (with the MIC80 value of 0.0039μg/mL) than that of fluconazole against Candida albicans and also showed higher activity than that of the other positive controls. Computational docking experiments indicated that the inhibition of CYP51 involves a coordination bond with iron of the heme group, the hydrophilic H-bonding region, the hydrophobic region, and the narrow hydrophobic cleft. In addition, the activity of the compounds would be enhanced when the side chains were shorter. [Copyright &y& Elsevier]