5,7,3'-trimethoxyflavone | 103430-01-9

• 分子结构分类: 有机化合物 - 苯丙烷和聚酮 - 黄酮类化合物
• 英文名称: 5,7,3'-trimethoxyflavone
• 英文别名: 5,7,3′ -trimethoxyflavone；5,7-dimethoxy-2-(3'-methoxyphenyl)-4H-chromen-4-one；5,7-dimethoxy-2-(3-methoxyphenyl)chromen-4-one
• CAS: 103430-01-9
• 化学式: C₁₈H₁₆O₅
• 分子量: 312.322
• InChiKey: VXUYWDCUZZMTJC-UHFFFAOYSA-N

物化性质

• 沸点：
  507.4±50.0 °C(Predicted)
• 密度：
  1.242±0.06 g/cm3(Predicted)

计算性质

• 辛醇/水分配系数(LogP)：
  2.2
• 重原子数：
  23
• 可旋转键数：
  4
• 环数：
  3.0
• sp3杂化的碳原子比例：
  0.17
• 拓扑面积：
  54
• 氢给体数：
  0
• 氢受体数：
  5

反应信息

• 作为反应物：
  描述：

  5,7,3'-trimethoxyflavone 在 氢溴酸 作用下， 生成 5,3'-dihydroxy-7-methoxyflavone
  参考文献：
  名称：

  花青素。第一部分：选择性甲基化和去甲基化

  摘要：

  DOI：

  10.1039/jr9540004065
• 作为产物：
  描述：

  2,4,6-三羟基苯乙酮一水合物 在 potassium carbonate 、 2,3-二氯-5,6-二氰基-1,4-苯醌 、 potassium hydroxide 作用下， 以 1,4-二氧六环 、 乙醇 、 丙酮 为溶剂， 反应 40.0h， 生成 5,7,3'-trimethoxyflavone
  参考文献：
  名称：

  Unraveling the anti-influenza effect of flavonoids: Experimental validation of luteolin and its congeners as potent influenza endonuclease inhibitors

  摘要：

  The biological effects of flavonoids on mammal cells are diverse, ranging from scavenging free radicals and anti-cancer activity to anti-influenza activity. Despite appreciable effort to understand the anti-influenza activity of flavonoids, there is no clear consensus about their precise mode-of-action at a cellular level. Here, we report the development and validation of a screening assay based on AlphaScreen technology and illustrate its application for determination of the inhibitory potency of a large set of polyols against PA N-terminal domain (PA-Nter) of influenza RNA-dependent RNA polymerase featuring endonuclease activity. The most potent inhibitors we identified were luteolin with an IC₅₀ of 72 ± 2 nM and its 8-C-glucoside orientin with an IC₅₀ of 43 ± 2 nM. Submicromolar inhibitors were also evaluated by an in vitro endonuclease activity assay using single-stranded DNA, and the results were in full agreement with data from the competitive AlphaScreen assay. Using X-ray crystallography, we analyzed structures of the PA-Nter in complex with luteolin at 2.0 Å resolution and quambalarine B at 2.5 Å resolution, which clearly revealed the binding pose of these polyols coordinated to two manganese ions in the endonuclease active site. Using two distinct assays along with the structural work, we have presumably identified and characterized the molecular mode-of-action of flavonoids in influenza-infected cells.

  DOI：

  10.1016/j.ejmech.2020.112754

文献信息

• Flavonoid-based inhibitors of the Phi-class glutathione transferase from black-grass to combat multiple herbicide resistance
  作者：Maria Schwarz、Rebecca F. M. Eno、Stefanie Freitag-Pohl、Christopher R. Coxon、Hannah E. Straker、David J. Wortley、David J. Hughes、Glynn Mitchell、Jenny Moore、Ian Cummins、Nawaporn Onkokesung、Melissa Brazier-Hicks、Robert Edwards、Ehmke Pohl、Patrick G. Steel

  DOI：10.1039/d1ob01802g

  日期：——

  discovered a specific flavonoid as a natural ligand of the recombinant enzyme. A series of related synthetic flavonoids was prepared and their binding to AmGSTF1 was investigated showing a high affinity for derivatives bearing a O-5-decyl-α-carboxylate. Molecular modelling based on high-resolution crystal structures allowed a binding pose to be defined which explained flavonoid binding specificity.

  禾本科杂草多重除草剂抗性（MHR）的进化和增长继续威胁着全球谷物生产。虽然多种过程可能导致耐药性，但早期的工作已将 phi 类谷胱甘肽-S-转移酶 ( Am GSTF1) 确定为黑草 ( Alopecurus myosuroides ) 中 MHR 的功能性生物标志物。这项研究结合化学和结构生物学，进一步深入了解Am GSTF1 在 MHR 中的作用。获得了野生型Am GSTF1 的晶体结构，以及两个专门设计的变体，这些变体允许与Am GSTF1 抑制剂 4-氯-7-硝基-苯并呋喃 (NBD-Cl) 的谷胱甘肽和谷胱甘肽加合物进行共晶结构测定。这些研究表明NBD-Cl的抑制活性与活性位点的封闭和底物结合的阻碍有关。使用配体钓鱼实验寻找Am GSTF1 的其他选择性抑制剂，确定了许多黄酮类化合物作为潜在的配体。随后使用黑草提取物进行的实验发现了一种特定的黄酮类化合物作为重组酶的天然配体。制备
• Selective and efficient oxidative modifications of flavonoids with 2-iodoxybenzoic acid (IBX)
  作者：Maurizio Barontini、Roberta Bernini、Fernanda Crisante、Giancarlo Fabrizi

  DOI：10.1016/j.tet.2010.06.014

  日期：2010.8

  2-Iodoxybenzoic acid (IBX), a mild and efficient hypervalent iodine oxidant, has been utilised in different reaction conditions to perform several efficient oxidative modifications of flavonoids. Fine-tuning of the reaction conditions allowed remarkably selective modifications of these compounds. At room temperature, IBX proved to be an excellent reagent for a highly regioselective aromatic hydroxylation of monohydroxylated flavanones and flavones, generating the corresponding catecholic derivatives showing high antioxidant activity. At 90 degrees C, IBX efficiently dehydrogenated a large panel of methoxylated flavanones to their corresponding flavones exhibiting anticancer activity. IBX polystyrene has also been utilised to increase the recovery of highly polar compounds. Following the first oxidation, the reagent was recovered and reused in several runs without loss of efficiency and selectivity. The first example of an application of IBX polystyrene in a dehydrogenation reaction has been described. (c) 2010 Elsevier Ltd. All rights reserved.
• Cleavage of Methyl Ethers of Flavones by Chloroaluminate Ionic Liquid
  作者：Tao Liu、Yongzhou Hu

  DOI：10.1081/scc-200028625

  日期：2004.1

  A new o-demethylation method of a series of mono-, di-, trimethoxy-flavones using a chloroalununate ionic liquid-[BMIM] [Al2Cl7] in dichloromethane is described. The desired products were obtained in moderate to good yields.
• Modulation of human neutrophils' oxidative burst by flavonoids
  作者：Daniela Ribeiro、Marisa Freitas、Sara M. Tomé、Artur M.S. Silva、Graça Porto、Eduarda Fernandes

  DOI：10.1016/j.ejmech.2013.06.019

  日期：2013.9

  Inflammation is a normal response towards tissue injury, but may become deleterious to the organism if uncontrolled. The overproduction of reactive species during the inflammatory process may cause or magnify the damage at inflammatory sites. Flavonoids have been suggested as therapeutic agents to avoid such damage, as these compounds exhibit anti-inflammatory activity, through the modulation of oxidative stress and signalling pathways. Both effects may attenuate neutrophils' activities at inflammatory sites. In this study, we investigated the structure/activity relationship of a series of flavonoids on the oxidative burst of human neutrophils in vitro, as a measure of its anti-inflammatory potential. Neutrophils were stimulated with phorbol-12-myristate-13-acetate, and fluorescence and chemiluminescence techniques were used to evaluate the generation of reactive oxygen species. All the tested flavonoids revealed the ability to modulate the neutrophil's oxidative burst. From the obtained results, the pivotal role of the catechol group in the B-ring was evidenced as well as the minor importance of the hydroxylations in the A-ring, which did not appear to be determinant for the activity, although clearly influencing the lipophilicity of the tested flavonoids. It is also clarified the importance of the methylation in the OH group at the B-ring catechol moiety. In conclusion, the obtained results uncover new possible strategies for the resolution of inflammatory processes, using flavonoids to modulate neutrophil's oxidative burst. (C) 2013 Elsevier Masson SAS. All rights reserved.
• Unraveling the anti-influenza effect of flavonoids: Experimental validation of luteolin and its congeners as potent influenza endonuclease inhibitors
  作者：Václav Zima、Kateřina Radilová、Milan Kožíšek、Carlos Berenguer Albiñana、Elena Karlukova、Jiří Brynda、Jindřich Fanfrlík、Miroslav Flieger、Jan Hodek、Jan Weber、Pavel Majer、Jan Konvalinka、Aleš Machara

  DOI：10.1016/j.ejmech.2020.112754

  日期：2020.12

  The biological effects of flavonoids on mammal cells are diverse, ranging from scavenging free radicals and anti-cancer activity to anti-influenza activity. Despite appreciable effort to understand the anti-influenza activity of flavonoids, there is no clear consensus about their precise mode-of-action at a cellular level. Here, we report the development and validation of a screening assay based on AlphaScreen technology and illustrate its application for determination of the inhibitory potency of a large set of polyols against PA N-terminal domain (PA-Nter) of influenza RNA-dependent RNA polymerase featuring endonuclease activity. The most potent inhibitors we identified were luteolin with an IC₅₀ of 72 ± 2 nM and its 8-C-glucoside orientin with an IC₅₀ of 43 ± 2 nM. Submicromolar inhibitors were also evaluated by an in vitro endonuclease activity assay using single-stranded DNA, and the results were in full agreement with data from the competitive AlphaScreen assay. Using X-ray crystallography, we analyzed structures of the PA-Nter in complex with luteolin at 2.0 Å resolution and quambalarine B at 2.5 Å resolution, which clearly revealed the binding pose of these polyols coordinated to two manganese ions in the endonuclease active site. Using two distinct assays along with the structural work, we have presumably identified and characterized the molecular mode-of-action of flavonoids in influenza-infected cells.