3-(1,3,4-Thiadiazole-2-yl)quinoline derivatives: Synthesis, characterization and anti-microbial activity
摘要:
A new series of thiadiazoles and intermediate thiosemicarbazones were synthesized from the chloroquinone molecule, with an aim to explore their effect on in vitro growth of microorganisms causing microbial infection. The chemical structures of the compound were elucidated by elemental analysis, FTIR, 1H and 13C NMR and ESI-MS spectral data. In vitro anti-microbial activity was performed against Staphylococcus aureus, Streptococcus pyogenes, Salmonella typhimurium, and Escherichia coli. The MIC was detected using the double dilution method. The results were compared by calculating percent inhibit area/mu g of the compounds and the standard "amoxicillin". The selected compounds were tested for cytotoxic results using MIT assay H9c2 cardiac myoblasts cell line and the results showed that all the compounds offered remarkable >80% viability to a concentration of 200 mu g/mL. (C) 2011 Elsevier Masson SAS. All rights reserved.
our search for potential antiamoebic agents from folklore Indian medicinal plants, we found that the benzene and ethyl acetate extracts from the root bark of Adina cordifolia exhibited strong antiamoebic activity with IC50 values of 2.92 and 2.50 μg/ml, respectively. Bioassay-guided fractionation of benzene and ethyl acetate extracts led to the isolation of 7-hydroxycoumarin (umbelliferone 1) and
Bis-pyrazolines: Synthesis, characterization and antiamoebic activity as inhibitors of growth of Entamoeba histolytica
作者:Abdul R. Bhat、Fareeda Athar、Amir Azam
DOI:10.1016/j.ejmech.2007.11.005
日期:2009.1
condition led to the formation of new compounds, thiocarbamoyl bis-pyrazoline derivatives. The structure of the compounds were elucidated by UV, IR, 1H NMR, 13C NMR and ESI-MS spectral data and thermogravimetric analysis, and their purities were confirmed by elemental analyses. The antiamoebic activity of these complexes was evaluated by microdilution method against HM1:IMSS strain of Entamoeba histolytica
在碱性条件下,用N-4取代的硫代氨基脲将查尔酮环化,导致形成新的化合物硫代氨基甲酰基双吡唑啉衍生物。通过UV,IR,1 H NMR,13 C NMR和ESI-MS光谱数据以及热重分析阐明了化合物的结构,并通过元素分析证实了其纯度。这些复合物的antiamoebic活性通过对微量稀释法评估HM1:IMSS的应变阿米巴并将结果与标准药物甲硝唑进行比较。结构-活性关系表明,在硫代氨基甲酰基上具有芳香取代基的化合物比具有环状基团的化合物更具活性。但是,从IC 50值可以清楚地看出,化合物15和20具有更高的活性,并且两者都显示出结构相似性,其中吸电子基团连接在苯环上。MTT分析表明所有化合物对人肾上皮细胞系无毒。
Synthesis, spectral studies and antiamoebic activity of new 1-N-substituted thiocarbamoyl-3-phenyl-2-pyrazolines
Thirty new pyrazoline derivatives were synthesized by cyclization of Mannich bases with thiosemicarbazides being substituted by different cyclic and aromatic amines. The structures of the compounds were elucidated by elemental analyses, UV, IR, H-1 and C-13 NMR and ESI-MS spectral data. The in vitro antiamoebic activity was evaluated against Entamoeba histolytica in comparison with metronidazole used as reference substance. Out of the 30 compounds screened for antiamoebic activity, 10 (5, 6, 15, 18, 25-30) were found to be better inhibitors of E. histolytica since they showed lesser IC50 values than metronidazole. The preliminary results indicated that the presence of 3-chloro or 3-bromo substituent on the phenyl ring at position 3 of the pyrazoline ring enhanced the antiamoebic activity as compared to unsubstituted phenyl ring. The study suggests that the preliminary activity of these compounds may further be explored for the development of new targets for amoebiasis. (C) 2007 Elsevier Masson SAS. All rights reserved.
Synthesis and antiamoebic activity of 3,7-dimethyl-pyrazolo[3,4-e][1,2,4] triazin-4-yl thiosemicarbazide derivatives
A series of 3,7-dimethyl-pyrazolo[3,4-e] [ 1,2,4]triazin-4-yl thiosemicarbazide derivatives 3-22 were prepared and evaluated in vitro against HMI:IMSS strain of Entamoeba histolytica, to identify the compounds for antiamoebic activity. They exhibited antiamoebic activity in the range (IC50 = 0.81-7.31 mu M). The results were compared to the activity of known drug metronidazole. It is inferred from the in vitro studies that the compounds 10, 11. 17 and 18 were found to be significantly better inhibitors of E. histolytica since IC50 values in the mu M range elicited by these compounds are much lower than metronidazole. Besides, compounds 11 and 17 have shown the most promising antiamoebic activity (IC50 = 0.81 mu M of 11, IC50 = 0.84 mu M of 17 versus IC50 = 1.81 mu M of metronidazole). The study suggests the possibility of developing triazine analogues as potential drug candidates for antiamoebic activity. (c) 2005 Elsevier B.V. All rights reserved.
Synthesis and Characterization of a New Series of Hydroxy Pyrazolines
作者:Humaira Parveen、Prince Firdoos Iqbal、Amir Azam
DOI:10.1080/00397910802241407
日期:2008.10.28
3-Phenyl-1-(thiophen-2-yl)prop-2-en-1-one obtained by Claisen-Schmidt condensation of 2-acetyl thiophene with benzaldehyde was converted into 2,3-dibromo-3-phenyl-1-(thiophen-2-yl)propan-1-one, which on treatment with various thiosemicarbazides in the presence of triethylamine in absolute ethanol, yielded the corresponding hydroxy pyrazolines 3a-h. All the compounds were characterized by IR, (1)H NMR, and (13)C NMR spectra.