Synthesis and quantitative structure-activity relationships of some antibacterial 3-formylrifamycin SV N-(4-substituted phenyl)piperazinoacethydrazones
作者:Judith A. Kiritsy、David K. Yung、David E. Mahony
DOI:10.1021/jm00210a025
日期:1978.12
A series of 14 3-formylrifamycin SV N-(4-substituted phenyl)piperazinoacethydrazones has been synthesized and evaluated for their antimicrobial activity. The compounds were found active against Bacillus subtilis, Staphylococcus aureus, Mycobacterium phlei, and Mycobacterium tuberculosis but not as active as rifampin. The compounds also exhibited significant activity against Clostridium perfringens and in this bacterial system some were more active than rifampin. The QSAR showed that the activity against B. subtilis depended only on lipophilicity, and the regression equation was linear. A parabolic relationship between the antibacterial activity and lipophilicity of the compounds was found in Staph. aureus. Additionally, the activity was dependent upon the electronic and steric effects of the phenyl substituents. The sensitivity of M. phlei to the compounds was found to correlate well with a linear combination of hydrophobic, electronic, and steric parameters. No statistically significant correlation was possible between the physicochemical parameters studied and the activity of the compounds against C. perfringens and M. tuberculosis.
Microwave‐Assisted Synthesis, Antioxidant, and Antimicrobial Evaluation of Piperazine‐Azole‐Fluoroquinolone Based 1,2,4‐Triazole Derivatives
作者:Serap Basoglu Ozdemir、Neslihan Demirbas、Ahmet Demirbas、Faik Ahmet Ayaz、Nesrin Çolak
DOI:10.1002/jhet.3336
日期:2018.12
Azole derivatives (10a–f) obtained starting from 1‐(4‐fluorohenyl)piperazine were converted to the corresponding Mannich bases (7a–d, 12a,b, and 16a,b) containing β‐lactame or flouroquinolone core via a one‐pot three‐component reaction. The synthesis of conazole analogues was carried out starting from triazole by three steps. Reactions were carried out under conventional‐mediated and microwave‐mediated
The biological evaluation showed that compounds 3i and 3j displayed significant activity against AChE. The compounds 3i and 3j displayed IC50 values of 0.034 and 0.027 µM against AChE, respectively. The reference drug donepezil (IC50 = 0.021 µM) also displayed a significant inhibition against AChE. In addition, the antioxidant activities of the compounds were also evaluated. Derivatives 3i and 3j, which