Several 3-carbonyl (1–26), 3-acyl (27–52), and 3-carboxyhydrazido (53–58) coumarins have been synthesized in high yields (72–99%) and tested in vitro for their human monoamine oxidase A and B (hMAO-A and hMAO-B) inhibitory activity. Different substituents on the coumarin nucleus were evaluated for their effect on biological activity and isoform selectivity. Substitution at position C7 of the 3-ethyl
Bioorthogonal Enzymatic Activation of Caged Compounds
作者:Cornelia Ritter、Nathalie Nett、Carlos G. Acevedo‐Rocha、Richard Lonsdale、Katja Kräling、Felix Dempwolff、Sabrina Hoebenreich、Peter L. Graumann、Manfred T. Reetz、Eric Meggers
DOI:10.1002/anie.201506739
日期:2015.11.2
as highly active and selective catalysts for the bioorthogonal uncaging of propargylic and benzylic ether protected substrates, including uncaging in living E. coli. observed selectivity is supported by induced‐fit docking and molecular dynamics simulations. This proof‐of‐principle study points towards the utility of bioorthogonal enzyme/protecting group pairs for applications in the life sciences
Antioxidants have been the subject of intense research interest due to their numerous health benefits. In this work, a series of new conjugates of hydroxytyrosol and coumarin were synthesized and evaluated for their free radical scavenging, toxicity and antioxidant mechanism in vitro. The all target compounds 14a–t exhibited better radical scavenging activity than BHT, hydroxytyrosol, and coumarin
抗氧化剂由于其许多健康益处而已成为人们广泛研究的主题。在这项工作中,合成了一系列新型的羟基酪醇和香豆素共轭物,并对其体外自由基清除,毒性和抗氧化机理进行了评估。在DPPH自由基和ABTS +自由基阳离子清除试验中,所有目标化合物14a–t均表现出比BHT,羟基酪醇和香豆素更好的自由基清除活性。结构-活性关系研究表明,香豆素环上羟基的数量和位置对于良好的抗氧化能力至关重要。此外,最有前途的化合物14q在正常的WI-38和GES细胞中,溶血试验显示的毒性比BHT弱,抗增殖作用较弱,并且H 2 O 2诱导的HepG2细胞活力增强。另外,14q降低了HepG2细胞的凋亡百分比,减少了ROS的产生和LDH的释放,并改善了H 2 O 2处理的HepG2细胞中的GSH和SOD水平。最后,在甲醇溶液中,14q比羟基酪醇具有更高的稳定性。这些结果表明,羟基酪醇和香豆素的结合物显示出更好的抗氧化能力,并且是发现新型潜在抗氧化剂的有效方法。
Condensation of salicylaldehydes with ethyl 4,4,4-trichloro-3-oxobutanoate: a facile approach for the synthesis of substituted 2H-chromene-3-carboxylates
作者:Mudulkar Sairam、Gannerla Saidachary、Bhimapaka China Raju
DOI:10.1016/j.tetlet.2015.01.114
日期:2015.3
A highly efficient and simple protocol has been developed for the preparation of ethyl 2-oxo-2H-chromene-3-carboxylates 3a–v by the condensation of salicylaldehydes 1a–v with ethyl 4,4,4-trichloro-3-oxobutanoate 2 for the first time. The reaction is proceeding via Knoevenagel pathway followed by a selective addition of the phenolic hydroxyl group to the carbonyl group adjacent to the CCl3 group rather
Design, synthesis and biological evaluation of coumarin-based N-hydroxycinnamamide derivatives as novel histone deacetylase inhibitors with anticancer activities
A series of novel coumarin-based N-hydroxycinnamamide derivatives were designed and synthesized as histonedeacetylase (HDAC) inhibitors. Most of the synthesized compounds showed potent HDAC inhibitory activity and significant antiproliferative activity against human cancer cell lines MCF-7, HepG2, HeLa and HCT-116. Among them, compound 14f displayed the most potent HDAC inhibition, especially against