Synthesis, biological evaluation and SAR study of novel pyrazole analogues as inhibitors of Mycobacterium tuberculosis
摘要:
As a continuation of our previous work that turned toward the identification of antimycobacterial compounds with innovative structures, two series of pyrazole derivatives were synthesized by parallel solution-phase synthesis and were assayed as inhibitors of Mycobacterium tuberculosis (MTB), which is the causative agent of tuberculosis. One of these compounds showed high activity against MTB (MIC = 4 mu g/mL). The newly synthesized pyrazoles were also computationally investigated to analyze their fit properties to the pharmacophoric model for antitubercular compounds previously built by us and to re. ne structure-activity relationship analysis. (C) 2008 Elsevier Ltd. All rights reserved.
New azo- and bisazo-5-pyrazolone dyes have been synthesised by azo coupling of various arylamines and aryl diamines with 5-pyrazolones: 1-methyl-3-phenyl-1H-pyrazol-5(4H)-one, 1-(4-chlorophenyl)-3-isopropyl-1H-pyrazol-5(4H)-one and 3-isopropyl-1-(4-methoxyphenyl)-1H-pyrazol-5(4H)-one, respectively. All new synthesised dyes have been characterised by FTIR, 1H, 13C NMR and UV-Vis spectral studies with
Synthesis and structural characterization of new oxovanadium(IV) complexes derived from azo-5-pyrazolone with prospective medical importance
作者:Emine Bagdatli、Eylem Altuntas、Ulku Sayin
DOI:10.1016/j.molstruc.2016.08.026
日期:2017.1
thermogravimetric (TG/DTG) analysis. They have the composition [VO(L) 2 ]·H 2 O; ( 3a–c ) or [VO(L) 2 ]·CH 3 OH; ( 3d ) where LH is an azo-5-pyrazolone compound as the ligand ( 2a–d ). The electronic spectra of the complexes are typical of oxovanadium(IV) complexes showing a low intensity band near 500 nm. Spectroscopic results have shown that azo-5-pyrazolone compounds have acted bidendate and the coordination
Multicomponent reactions of 1,3-disubstituted 5-pyrazolones and formaldehyde in environmentally benign solvent systems and their variations with more fundamental substrates
作者:Jia-Neng Tan、Minghao Li、Yanlong Gu
DOI:10.1039/b924699a
日期:——
Many multicomponentreactions (MCRs) of 1,3-disubstituted 5-pyrazolones and formaldehyde were developed in environmentally benign solvent systems. Styrenes, vinylferrocene and 2-phenylindoles could easily react, under solvent-free conditions or in glycerol solvent, with 1,3-disubstituted 5-pyrazolones and paraformaldehyde in the absence of any catalyst to afford a variety of complex skeletons in moderate
prepared complexes. These complexes are mononuclear and the copper(II) complexes have distorted square-planar geometry as determined by ESR. Spectral studies confirm the coordination of 4-aroyl-5-pyrazolone ligands through the carbonyl moieties to the metal. All the copper(II) complexes coordinated to the metal by enolization and the palladium(II) complexes showed ‘Type B’ coordination. The ligand which
合成了新颖的双齿4-芳酰基-5-吡唑啉酮配体,并与铜(II)和钯(II)盐以1:2(金属:配体)等摩尔比反应,导致形成了八个新的配位化合物。所有合成的化合物均具有FTIR,UV-Vis,ESI-Mass,1 H NMR,13的特征C-APT以及顺磁性钯(II)配合物的ESR光谱研究。此外,元素和热重分析(TG / DTG)应用于所有制备的配合物。这些配合物是单核的,而铜(II)配合物具有扭曲的方平面几何形状,这是由ESR确定的。光谱研究证实了4-芳酰基-5-吡唑啉酮配体通过羰基与金属的配位。所有铜(II)配合物通过烯醇化与金属配位,而钯(II)配合物显示为' B型的协调。具有1-(4-甲氧基)苯基取代的吡唑啉酮环的配体在配位球外得到具有水分子的铜(II)配合物。所提出的配合物结构与热重分解结果非常吻合。
A copper-catalyzed asymmetric Friedel–Crafts hydroxyalkylation of pyrazole-4,5-diones with 5-aminoisoxazoles
作者:Siyu Gao、Xiang Sun、Sijie Peng、Zhenggen Zha、Qi Sun、Zhiyong Wang
DOI:10.1039/d4ob00322e
日期:——
An asymmetric Friedel–Crafts hydroxyalkylation reaction of 5-aminoisoxazoles with pyrazole-4,5-diones was developed under the catalysis of 5% chiral copper complexes. This reaction exhibits functional group tolerance and excellent enantioselectivity. Moreover, the reaction can be scaled up and its mechanism was studied.