Synthesis, single crystal X-ray analysis, and antifungal profiling of certain new oximino ethers bearing imidazole nuclei

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Abstract

Fungal infections threaten human health, particularly in immune-compromised patients worldwide. Although there are a large number of antifungal agents available, the desired clinical attributes for the treatment of fungal infections have not yet been achieved. Azoles are the mainstay class of the clinically used antifungal agents. In the current study, the synthesis, spectroscopic characterization, and antifungal activity of certain new oximino ethers Va-n bearing imidazole nuclei are reported. The (E)-configuration of the imine double bond of the synthesized compounds Va-n has been confirmed via single crystal X-ray analysis of compound Vi as a representative example of this class of compounds. The molecular structure of compound Vi was crystallized in the monoclinic, P21/c, a = 18.7879(14) Å,β= 5.8944(4) Å, c = 16.7621(12) Å3,β= 93.063(3)β V = 1855.5(2) Å3, Z = 4. The in vitro antifungal activity of the synthesized compounds Va-n were evaluated using diameter of the inhibition zone (DIZ) and minimum inhibitory concentration (MIC) assays against different fungal strains. Compound Ve manifested anti-Candida albicans activity with an MIC value of 0.050 μmol/mL, being almost equipotent with the reference antifungal drug fluconazole (FLC),while compounds Vi and Vn are the most active congeners against Candida parapsilosis, being equipotent and about twenty-three times more potent than FLC with an MIC value of 0.002 μmol/mL. The results of the current report might support the development of new potent and safer antifungal azoles.

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Al-Wabli, R. I., Al-Ghamdi, A. R., Ghabbour, H. A., Al-Agamy, M. H., & Attia, M. I. (2017). Synthesis, single crystal X-ray analysis, and antifungal profiling of certain new oximino ethers bearing imidazole nuclei. Molecules, 22(11). https://doi.org/10.3390/molecules22111895

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