Remarkable antioxidant properties of a series of hydroxy-3-arylcoumarins
摘要:
In the present work we synthesized a series of hydroxy-3-arylcoumarins (compounds 1-9), some of them previously described as MAO-B selective inhibitors, with the aim of evaluating their antioxidant properties. Theoretical evaluation of ADME properties of all the derivatives was also carried. out. From the ORAC-FL, ESR and CV data it was concluded that these derivatives are very good antioxidants, with a very interesting hydroxyl, DPPH and superoxide radicals scavenging profiles. In particular compound 9 is the most active and effective antioxidant of the series (ORAC-FL = 13.5, capacity of scavenging hydroxyl radicals = 100%, capacity of scavenging DPPH radicals = 65.9% and capacity of scavenging superoxide radicals = 71.5%). Kinetics profile for protection fluorescein probe against peroxyl radicals by addition of antioxidant molecule 9 was also performed. Therefore, it can operate as a potential candidate for preventing or minimizing the free radicals overproduction in oxidative-stress related diseases. (C) 2013 The Authors. Published by Elsevier Ltd. All rights reserved.
Decarboxylation of α,β-unsaturated aromatic lactones: synthesis of<i>E-ortho</i>-hydroxystilbenes from 3-arylcoumarins or isoaurones
作者:Xihua Huang、Jie Liu、Jianfei Sheng、Xianheng Song、Zhibo Du、Mingkang Li、Xuejing Zhang、Yong Zou
DOI:10.1039/c7gc02994b
日期:——
A simple and environmentally friendly strategy for the synthesis of E-ortho-hydroxystilbenes has been established. Two kinds of α,β-unsaturatedaromatic lactones, i.e. the 3-arylcoumarins and the isoaurones, could both readily undergo a cascade hydrolyzation/decarboxylation reaction in the presence of KOH in ethylene glycol to afford the desired E-ortho-hydroxystilbenes in moderate to high yields.
The procedure consists of a sequence of some reactions including an arylation/decarboxylation cascade and proceeds well in aqueous media to afford biologically interesting flavones and 3-arylcoumarins. This method exhibited excellent selectivity and functional group tolerance under mild conditions. The reaction also showed perfect efficacy for the preparation of styryl coumarins.
使用K 2 S 2 O 8,实现了色农酮与芳基硼酸的高度区域选择性和无过渡金属的一锅芳基化反应。该程序由一系列反应组成,包括芳基化/脱羧级联,并在水性介质中进行得很好,从而提供了生物学上令人感兴趣的黄酮和3-芳基香豆素。该方法在温和条件下显示出极好的选择性和官能团耐受性。该反应还显示出制备苯乙烯基香豆素的完美功效。
MAO Inhibitory Activity of 2-Arylbenzofurans versus 3-Arylcoumarins: Synthesis, in vitro Study, and Docking Calculations
作者:Giulio Ferino、Enzo Cadoni、Maria João Matos、Elias Quezada、Eugenio Uriarte、Lourdes Santana、Santiago Vilar、Nicholas P. Tatonetti、Matilde Yáñez、Dolores Viña、Carmen Picciau、Silvia Serra、Giovanna Delogu
DOI:10.1002/cmdc.201300048
日期:2013.6
Monoamine oxidase (MAO) is an important drug target for the treatment of neurological disorders. Several 3‐arylcoumarin derivatives were previously described as interesting selective MAO‐B inhibitors. Preserving the trans‐stilbene structure, a series of 2‐arylbenzofuran and corresponding 3‐arylcoumarin derivatives were synthesized and evaluated as inhibitors of both MAO isoforms, MAO‐A and MAO‐B. In general
单胺氧化酶(MAO)是治疗神经系统疾病的重要药物靶标。以前有几种3-芳基香豆素衍生物被描述为有趣的选择性MAO-B抑制剂。保留了反式二苯乙烯结构,合成了一系列的2-芳基苯并呋喃衍生物和相应的3-芳基香豆素衍生物,并将其评估为MAO-A和MAO-B的抑制剂。通常,发现两种类型的衍生物都是选择性的MAO-B抑制剂,IC 50值在纳摩尔至微摩尔范围内。5-硝基-2-(4-甲氧基苯基)苯并呋喃(8)是苯并呋喃系列中活性最高的化合物,具有MAO-B选择性和可逆抑制作用(IC 50 = 140 n M)。具有与化合物8相同的取代模式的3-(4'-甲氧基苯基)-6-硝基香豆素(15)被发现是香豆素系列中活性最高的MAO-B抑制剂(IC 50 = 3 n M) 。但是,3-苯基香豆素14的活性在相同范围内(IC 50 = 6 n M),可逆,并且选择性也比化合物15高出几倍。将最具活性的化合物对接到MAO
Palladium-Catalyzed Decarboxylative Cross-Coupling Reactions: A Route for Regioselective Functionalization of Coumarins
作者:Farnaz Jafarpour、Samaneh Zarei、Mina Barzegar Amiri Olia、Nafiseh Jalalimanesh、Soraya Rahiminejadan
DOI:10.1021/jo302778d
日期:2013.4.5
A straightforward, regioselective, and step-economical ligand-free palladium-catalyzed decarboxylative functionalization of coumarin-3-carboxylic acids is devised. This protocol is compatible with a wide variety of electron-donating and -withdrawing substituents and allows for construction of various biologically important π-electron extended coumarins.
2-phenylbenzo[b]furan glycosides could promote estrogen biosynthesis. To find high active 2-phenylbenzo[b]furans, fifty-four 2-phenylbenzo[b]furans were prepared via four strategies according to corresponding substrate scopes. Biological evaluation in HEK293A cells showed that some compounds exhibited promotive activity on estrogen biosynthesis. 2-(4-Chlorophenyl)-7-methoxybenzo[b]furan possessed the