Various N-aryl-N'-phenylthioureas, N, N'-diarylthioureas and N-(1, 2, 4-triazol-3-yl)-N'-arylthioureas were prepared and examined for uncoupling activities. The results indicate that substitution at the 4-position of the phenyl groups of diaryl thioureas is very important for uncoupling activities. Diphenyl thioureas substituted with two or more halogen atoms exhibited strong activities. The highest activity was exhibited by a compound containing nitro groups on both phenyl groups. These results indicate that the hydrophobicity and acidic nature of the compound are of primary importance for uncoupling activities. A remarkable decrease in activity was observed with the thioureas which were substituted with pyridine and 1, 2, 4-triazole rings. The reaction of phenyl isothiocyanate with 3-amino-1, 2, 4-triazole was also studied.
Synthesis and Biological Evaluation of Halogenated 2-Arylimino-3-arythiazolidine- 4-ones Containing Benzoic Acid Fragments as Antibacterial Agents
作者:Jie Zhang、Likang Zheng、Huayong Liu、Dan Zhao、Di Qu、Shiqing Han
DOI:10.2174/15701808113109990031
日期:2013.10.1
A series of halogenated 2-arylimino-3-ary-thiazolidine-4-ones containing (5-furan-2-yl)-benzoic acid or (5-thiophene-2-yl)-benzoic acid fragments were synthesized, and evaluated in vitro for their antibacterial activity, antibiofilm activity, erythrocyte hemolysis and cytotoxicity. Compounds (7c, 7f, 7i, 7n and 7p) exhibited excellent potency in inhibiting the growth of Staphylococcus epidermidis ATCC35984 (minimal inhibitory concentration (MIC): 0.8 μg/mL). The five compounds also presented promising antibiofilm activity against S. epidermidis ATCC35984 and none of them showed obvious hemolytic activity and cytotoxicity. Further antibacterial effects of the selected five compounds (7c, 7f, 7i, 7n and 7p) against clinical isolates (methicillin-resistant Staphylococcus epidermidis and methicillin-resistant Staphylococcus aureus) were investigated in comparison with methicillin and ampicillin.7p showed the most potent antibacterial activities among the synthesized compounds.
Synthesis and biological evaluation of 2-arylimino-3-pyridin-thiazolineone derivatives as antibacterial agents
作者:Ming-Guang Cai、Yang Wu、Jun Chang
DOI:10.1016/j.bmcl.2016.03.089
日期:2016.5
With an intention to find more potent antibacterial agents, four halogen disubstituted thiazolineone derivatives (2a-d), five halogen monosubstituted thiazolineone derivatives (2e-i), and eleven 2-arylimino-3-pyridin-thiazolineone derivatives (2j-t) were synthesized and screened for their antibacterial activity, bactericidal activity, cytotoxicity, and erythrocyte hemolysis. Most of the synthesized
Synthetic Studies toward Aryl-(4-aryl-4<i>H</i>-[1,2,4]triazole-3-yl)-amine from 1,3-Diarylthiourea as Urea Mimetics
作者:Amarnath Natarajan、Yuhong Guo、Haribabu Arthanari、Gerhard Wagner、Jose A. Halperin、Michael Chorev
DOI:10.1021/jo0508189
日期:2005.8.1
4]triazole-3-yl-amines as urea mimetics from the corresponding 1,3-disubstituted thioureas has been studied, and the scope and limitations of this reaction are presented. The reaction proceeds through the formation of a carbodiimide, followed by a sequential addition−dehydration with acyl hydrazides. 1,3-Branched dialkylthioureas result in the formation of the corresponding ureas. The electronic and steric
A New Synthetic Protocol for the Preparation of Carbodiimides Using a Hypervalent Iodine(III) Reagent
作者:Yunyang Wei、Chenjie Zhu、Dan Xu
DOI:10.1055/s-0030-1258414
日期:2011.3
A new, simple, and efficient preparation of symmetrical and unsymmetrical carbodiimides from the corresponding thioureas via dehydrosulfurization using a hypervalent iodine(III) reagent is described. The oxidation afforded carbodiimides in excellent yields and high selectivity. A possible mechanism for the transformation is proposed. desulfurization - hypervalent iodine - oxidations - carbodiimides