Acid catalyzed rearrangements of aryl 3-(2-nitroaryl)oxiran-2-yl ketones
作者:V. A. Mamedov、V. L. Mamedova、A. T. Gubaidullin、D. B. Krivolapov、G. Z. Khikmatova、E. M. Mahrous、D. E. Korshin、O. G. Sinyashin
DOI:10.1007/s11172-020-2791-x
日期:2020.3
Studies of chemical behavior of aryl 3-(2-nitrophenyl)oxiran-3-yl ketones in acidic medium revealed the possible occurrence of two competitive rearrangements leading to 2-(2-oxo-2-arylacetamido)benzoic acids and 3-hydroxyquinolin-4(1 H )-ones.
[EN] NOVEL IMAGING AGENTS FOR DETECTING NEUROLOGICAL DYSFUNCTION<br/>[FR] NOUVEAUX AGENTS D'IMAGERIE POUR LA DÉTECTION D'UNE DYSFONCTION NEUROLOGIQUE
申请人:SIEMENS MEDICAL SOLUTIONS
公开号:WO2009102498A1
公开(公告)日:2009-08-20
Disclosed here in are compounds and methods of diagnosing Alzheimer's Disease or a predisposition thereto in a mammal, the method comprising administering to the mammal a diagnostically effective amount of a radiolabeled compound, wherein the compound is selected from the group consisting of radiolabeled flavones, coumarins, carbazoles, quinolinones, chromenones, imidazoles and triazoles derivatives, allowing the compound to distribute into the brain tissue, and imaging the brain tissue, wherein an increase in binding of the compound to the brain tissue compared to a normal control level of binding indicates that the mammal is suffering from or is at risk of developing Alzheimer's Disease
3-Hydroxyflavones vs. 3-hydroxyquinolinones: structure–activity relationships and stability studies on Ru<sup>II</sup>(arene) anticancer complexes with biologically active ligands
作者:Andrea Kurzwernhart、Wolfgang Kandioller、Éva A. Enyedy、Maria Novak、Michael A. Jakupec、Bernhard K. Keppler、Christian G. Hartinger
DOI:10.1039/c2dt32206d
日期:——
RuII(η6-arene) complexes, especially with bioactive ligands, are considered to be very promising compounds for anticancer drug design. We have shown recently that RuII(η6-p-cymene) complexes with 3-hydroxyflavone ligands exhibit very high in vitro cytotoxic activities correlating with a strong inhibition of topoisomerase IIα. In order to expand our knowledge about the structureâactivity relationships and to determine the impact of lipophilicity of the arene ligand and of the hydrolysis rate on anticancer activity, a series of novel 3-hydroxyflavone derived RuII(η6-arene) complexes were synthesised. Furthermore, the impact of the heteroatom in the bioactive ligand backbone was studied by comparing the cytotoxic activity of RuII(η6-p-cymene) complexes of 3-hydroxyquinolinone ligands with that of their 3-hydroxyflavone analogues. To better understand the behaviour of these RuII complexes in aqueous solution, the stability constants and pKa values for complexes and the corresponding ligands were determined. Furthermore, the interaction with the DNA model 5â²-GMP and with a series of amino acids was studied in order to identify potential biological target structures.
Preparation of 1,2-disubstituted-3-hydroxy-4(1<i>H</i>)-quinolinones and the influence of substitution on the course of cyclization
作者:Pavel Hradil、Jan Hlaváč、Karel Lemr
DOI:10.1002/jhet.5570360121
日期:1999.1
Synthesis of 1,2-disubstituted-3-hydroxy-4(1H)-quinolinones by the cyclization of N-substituted phenacyl or acetonyl anthranilates is described. Two methods were employed for cyclization of anthranilates. Heating in polyphosphoric acid has a wide scope of applicability. The thermal cyclization in boiling N-methylpyrrolidone is limited by steric effect.
2-Aryl-3-hydroxyquinolones, a new class of dyes with solvent dependent dual emission due to excited state intramolecular proton transfer
作者:Dmytro A. Yushchenko、Volodymyr V. Shvadchak、Andrey S. Klymchenko、Guy Duportail、Yves Mély、Vasyl G. Pivovarenko
DOI:10.1039/b601400c
日期:——
the fluorescence properties of a series of 2-aryl-3-hydroxyquinolones (3HQs) were investigated and compared with the properties of well-studied 3-hydroxyflavone. All these compounds were found to display dualfluorescence with well-separated bands in organic solvents and aqueous solutions. Using steady-state and time-resolved fluorescence spectroscopy, we showed that their dualfluorescence is due