the present investigation, a new series of pyrazoline derivatives has been synthesized by the reaction of chalcones with hydrazinederivatives like hydrazine hydrate and phenyl hydrazines in the presence of different aliphatic acids. The chemical structure of the newly prepared compounds was characterized by 1H NMR, 13C NMR, FTIR, LC–MS and some of them by single crystal XRD. The synthesized compounds
摘要在本研究中,通过查耳酮与肼衍生物如水合肼和苯基肼在不同的脂肪酸存在下反应合成了一系列新的吡唑啉衍生物。新制备的化合物的化学结构通过1 H NMR,13 C NMR,FTIR,LC-MS表征,其中一些通过单晶XRD表征。筛选合成的化合物的抗微生物,抗结核,清除DPPH和抗炎特性。一些测试化合物显示出有希望的抗菌,抗结核,DPPH清除和抗炎活性。 图形概要
Synthesis and Anti-inflammatory Activity of Fluorinated Phenyl Styryl Ketones and N-Phenyl-5-Substituted Aryl-3-p-(fluorophenyl) Pyrazolins and Pyrazoles
作者:L.V.G. Nargund、V. Hariprasad、G.R.N. Reddy
DOI:10.1002/jps.2600810910
日期:1992.9
ranged from 7 to 59% for substituted p-(fluorophenyl) styrylketones and from 12 to 21% for pyrazoles. No correlation was found between the anti-inflammatory activity of p-(fluorophenyl) styrylketones or substituted pyrazoles and their effectiveness at inhibiting bovine serum albumin denaturation. The low toxicity of p-(fluorophenyl) styrylketones was reflected by the dose that was lethal in 50% of
Predicting the photoinduced electron transfer thermodynamics in polyfluorinated 1,3,5-triarylpyrazolines based on multiple linear free energy relationships
作者:Manjusha Verma、Aneese F. Chaudhry、Christoph J. Fahrni
DOI:10.1039/b821042j
日期:——
The photophysical properties of 1,3,5-triarylpyrazolines are strongly influenced by the nature and position of substituents attached to the aryl-rings, rendering this fluorophore platform well suited for the design of fluorescent probes utilizing a photoinduced electron transfer (PET) switching mechanism. To explore the tunability of two key parameters that govern the PET thermodynamics, the excited state energy ΔE00 and the acceptor potential E(A/A−), a library of polyfluoro-substituted 1,3-diaryl-5-phenyl-pyrazolines was synthesized and characterized. The observed trends for the PET parameters were effectively captured through multiple Hammett linear free energy relationships (LFER) using a set of independent substituent constants for each of the two aryl rings. Given the lack of experimental Hammett constants for polyfluoro-substituted aromatics, theoretically derived constants based on the electrostatic potential at the nucleus (EPN) of carbon atoms were employed as quantum chemical descriptors. The performance of the LFER was evaluated with a set of compounds that were not included in the training set, yielding a mean unsigned error of 0.05 eV for the prediction of the combined PET parameters. The outlined LFER approach should be well suited for designing and optimizing the performance of cation-responsive 1,3,5-triarylpyrazolines.
The visible light mediated oxidation of 1,3,5-trisubstitutedpyrazolines under metal-free conditions was developed. Various substituted pyrazolines were oxidized to pyrazoles by irradiation with visible light/sunlight. A plausible mechanism was proposed for the light mediated oxidation proceeding via formation of intermediates with electron rich C-3 positions and electron deficient C-5 positions. Correlation