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Synthesis and anti-candidal activity of some new pyrazoline derivatives

Mashooq Ahmad Bhat, Abdul Arif Khan, Mohamed A. Al-Omar, Azmat Ali Khan

New pyrazoline derivatives were synthesized via the reaction of chalcones with cyclohexyl/phenyl thiosemicarbazide in presence of ethanol and acetic acid. All the compounds were confirmed by FT IR, ¹H NMR, ¹³C NMR and MS spectral data. The compounds (1-11) were evaluated for antifungal activity against various strains of Candida species and compared with standard drug Itraconazole. MIC₅₀ values were found to be within the range of 41.099-127.895 μg/ml and MIC₉₀ values were found to be within the range of 62.121-240.955 μg/ml. Compound 7 was found to be most potent antifungal agent against Candida strains. It appears that para-methoxy substitution at one phenyl ring and meta-methoxy substitution at other phenyl ring of pyrazoline moiety made a significant contribution to the anti- Candidal activity in this series of pyrazolines.