An in vivo active 1,2,5-oxadiazole Pt(II) complex: A promising anticancer agent endowed with STAT3 inhibitory properties
摘要:
New Pt(II) complexes (Pt-1-3) bearing 1,2,5-oxadiazole ligands (1-3) were synthesized, characterized and evaluated for their ability to disrupt STAT3 dimerization. Ligand 3 center dot HC1 showed cytotoxic effects on HCT-116 cells (IC50 = 95.2 mu M) and a selective ability to interact with STAT3 (IC50 = 8.2 mu M) versus STATI (IC50 > 30 mu M). Its corresponding platinum complex Pt -3 exhibited an increased cytotoxicity (IC50 = 18.4 mu M) and a stronger interaction with STAT3 (IC50 = 1.4 mu M), leading to inhibition of its signaling pathway. Pt -3 was also evaluated in cell-based assays for its action on p53 expression and on STAT3 phosphorylation. In syngeneic murine Lewis lung carcinoma (LLC) implanted in C57BL/6 mice, Pt 3 showed a higher antitumor activity with fewer side effects than cisplatin. (C) 2017 Elsevier Masson SAS. All rights reserved.
Quinoxalines. Part 13: Synthesis and mass spectrometric study of aryloxymethylquinoxalines and benzo[b]furylquinoxalines
作者:Ines Starke、Gerhard Sarodnick、Vladimir V. Ovcharenko、Kalevi Pihlaja、Erich Kleinpeter
DOI:10.1016/j.tet.2004.05.064
日期:2004.7
aryloxymethylquinoxalines, benzo[b]- and naphtho[2,1-b]furylquinoxalines, possessing potential biologicalactivity, was prepared, characterized by IR and NMR spectroscopy and their electron ionization (EI) mass spectra studied in detail. The aryloxymethylquinoxalines were obtained by reacting halogenomethylquinoxalines with bifunctional O-nucleophiles. The benzo[b]furylquinoxalines and naphtho[2,1-b]furylquinoxalines
制备了一系列具有潜在生物活性的新型芳氧基甲基喹喔啉,苯并[ b ]-和萘并[ 2,1- b ]呋喃基喹喔啉,并通过红外光谱和核磁共振谱进行了表征,并对其电子电离(EI)质谱进行了详细研究。通过使卤代甲基喹喔啉与双官能O-亲核试剂反应获得芳氧基甲基喹喔啉。所述苯并[ b ] furylquinoxalines和萘并[2,1- b通过两个途径制备]呋喃基喹喔啉,这两个途径在合成中涉及的两个环化步骤的顺序上是不同的。通过精确的质谱测量确定了通过EI质谱法获得的离子的组成,并通过B / E链接扫描和碰撞诱导的离解阐明了裂解途径。研究的化合物的质谱行为与可能的OH损失有关 自由基被证明是非常有特色的。
Dual Photoredox/Palladium-Catalyzed C–H Acylation of 2-Arylpyridines with Oxime Esters
unprecedented dual photoredox/palladium-catalyzed iminyl-radical-mediated C–C bond cleavage and directed ortho C–H acylation of 2-arylpyridines by using oxime esters is described. Oxime esters can serve as efficient acyl sources through formation of the corresponding acylradicals by photoredox-catalyzed iminyl-radical-mediated C–C bond cleavage. This redox-neutral protocol features excellent regioselectivity
Reaction of Z isomers of alkylaromatic 1,2-hydroxylamino oximes with 1,2-diketones
作者:S. A. Amitina、I. A. Grigor’ev、A. Ya. Tikhonov
DOI:10.1007/s11172-006-0374-0
日期:2006.6
The reactions of Z isomers of alkylaromatic 1,2-hydroxylamino oximes containing the hydroxylamino group at the primary or secondary carbon atom with diacetyl afford 6-acetyl-5,6-dihydro-4H-1,2,5-oxadiazines. The reactions of these compounds with alkylaromatic 1,2-diketones produce N-substituted α-aroylnitrones or 6-aroyl-5,6-dihydro-4H-1,2,5-oxadiazines or, alternatively, their tautomeric mixtures
在伯或仲碳原子上含有羟基氨基的烷基芳族 1,2-羟基氨基肟的 Z 异构体与双乙酰反应得到 6-乙酰-5,6-二氢-4H-1,2,5-恶二嗪。这些化合物与烷基芳族 1,2-二酮的反应产生 N-取代的 α-芳酰基硝酮或 6-芳酰基-5,6-二氢-4H-1,2,5-恶二嗪或它们的互变异构混合物。
Visible Light Irradiation of Acyl Oxime Esters and Styrenes Efficiently Constructs β-Carbonyl Imides by a Scission and Four-Component Reassembly Process
Acyl radical triggered difunctionalizations of aryl olefins have been realized using oxime ester as the acyl precursor for the first time. Irradiation of fac-Ir(ppy)3 and oxime ester by visible light caused scission into three components, which recombined with olefins to yield significant β-carbonyl imides showing good functional group tolerance and high atom economy. Control experiments as well as