Synthesis and structure of new 3-pyrazolinylcoumarins and 3-pyrazolinyl-2-quinolones
作者:V. F. Traven、A. V. Manaev、I. V. Voevodina、I. N. Okhrimenko
DOI:10.1007/s11172-008-0195-4
日期:2008.7
The reactions of substituted 3-cinnamoyl-4-hydroxycoumarins and 3-cinnamoyl-4-hydroxy-2-quinolones with different phenylhydrazines gave 3-hetaryl-1H-4,5-dihydropyrazoles. The product structures were studied by 1H NMR spectroscopy and mass spectrometry. 4-Hydroxy-3-pyrazo-linylcoumarins exist in DMSO as two tautomers (4-enol and chromane-2,4-dione), while 4-hydroxy-3-pyrazolinyl-2-quinolones exist only in the enol form.
Preparation of Furo[3,2-<i>c</i>]coumarins from 3-Cinnamoyl-4-hydroxy-2<i>H</i>-chromen-2-ones and Acyl Chlorides: A Bu<sub>3</sub>P-Mediated C-Acylation/Cyclization Sequence
作者:Chia-Jui Lee、Cheng-Che Tsai、Shao-Hao Hong、Geng-Hua Chang、Mei-Chun Yang、Lennart Möhlmann、Wenwei Lin
DOI:10.1002/anie.201502789
日期:2015.7.13
3‐cinnamoyl‐4‐hydroxy‐2H‐chromen‐2‐ones though electrophilic addition of acyl chlorides towards the synthesis of highly functionalized furo[3,2‐c]coumarins bearing a phosphorus ylide moiety is described. These unprecedented cyclization reaction proceeds undermild reaction conditions within short reaction times (1 min to 1 h), and can be further applied in the synthesis of alkenyl‐substituted furo[3,2‐c]coumarins
Bu 3 P介导的3-肉桂酸酯-4-羟基-2-H-铬原子-2-酮的环化反应,通过亲电添加酰氯来合成高度功能化的带有磷叶立德部分的呋喃[3,2-c]香豆素描述。这些空前的环化反应在温和的反应条件下,在较短的反应时间(1分钟至1小时)内进行,并且可以通过在碱性条件下用羰基亲电试剂处理,进一步应用于烯基取代的呋喃[3,2-c]香豆素的合成。条件。
A coumarin–chalcone hybrid used as a selective and sensitive colorimetric and turn-on fluorometric sensor for Cd<sup>2+</sup> detection
作者:Shaily Shaily、Ajay Kumar、Naseem Ahmed
DOI:10.1039/c7nj02569f
日期:——
Chalcone based Naked-Eye colorimetric chemical sensor (E)-4-hydroxy-3-(3-(4-methoxyphenyl)acryloyl)-2H-chromen-2-one 1a was developed for selective and sensitive recognition of Cd2+ in mixed aqueous-organic media. The chemosensor demonstrate a distinct color change as well as remarkable variations in absorption and fluorescence enhancement in emission spectra upon interaction with Cd2+. The dual colorimetric
查耳酮基于裸眼比色化学传感器(ê)-4-羟基-3-(3-(4-甲氧基苯基)丙烯酰基)-2- ħ -色烯-2-酮1A被用于选择性和Cd的敏感识别开发2+在混合有机水介质。与Cd 2+相互作用时,化学传感器显示出明显的颜色变化以及发射光谱中吸收和荧光增强的显着变化。化学传感器1a对Cd2 +的双色度和荧光响应归因于1:1 [ 1a + Cd2 +]配合物的形成,这最终会影响其光学性能。Cd 2+与受体的缔合常数从Benesi–Hildebrand图和非线性最小二乘拟合获得的1a分别为9.56×10 5 M -1和(1.34±0.87)×10 6 M -1,检出限为5.84×10 -8M。与Cd 2+相互作用时化学传感器1a的荧光增强归因于在pH 7.0时发生的螯合增强荧光(CHEF)。
Synthesis and pharmacological properties of coumarin‐chalcones
作者:Donia Bensalah、Nasser Amri、Yousef E. Mukhrish、Waleed S. Koko、Naceur Hamdi
DOI:10.1016/j.mex.2023.102488
日期:2023.12
structure of the final compound. The antibacterial activity of the obtained products against various bacterial strains was tested in vitro. The antioxidant properties of the same synthesized compounds were also studied using DPPH (2,2-diphenyl-1-trinitrophenylhydrazine) and hydroxyl radical scavenging tests. Furthemore a study was conducted to highlight the nature of the effects produced by screening 2a-e and