KF/clinoptilolite nanoparticles as a novel catalyst for the green synthesis of chromens using three component reactions of 4‐hydroxycoumarins: Study of antioxidant activity
In this research, the green synthesis of chromen derivatives in good yields is described via three‐component reactions of 4‐hydroxycumarine, aldehydes or ketones, and methyl ketones in the presence of KF/clinoptilolite nanoparticles (KF/CP‐NPs) under solvent‐free conditions at 50°C in low time. The present methodology suggests some advantages such as low reaction time, easy and simple procedure, green
Design, synthesis and evaluation of 2,4-diarylpyrano[3,2-c]chromen-5(4H)-one as a new class of non-purine xanthine oxidase inhibitors
作者:Harpreet S. Virdi、Sahil Sharma、Samir Mehndiratta、P. M. S. Bedi、Kunal Nepali
DOI:10.3109/14756366.2014.961446
日期:2015.9.3
catalyst among the tested ones. The conjugates were evaluated for in-vitro xanthineoxidase activity. The results of the in-vitro assay were quite promising as some conjugates were endowed with remarkable inhibitory potential against the enzyme. HV-8, 11 and 12 were found to be high-potent inhibitors with HV-11 (the most potent inhibitor) possessing an IC50 value of 2.21 µM. The most active conjugate HV-11
efficient and selective approach for the synthesis of functionalized pyranocoumarins has been developed via a gold(III)-catalyzed tandem conjugate addition/annulation reaction of 4-hydroxycoumarins with α,β-unsaturatedketones.
Efficient synthesis of pyrano[3,2-c]coumarins has been achieved via copper(II) triflate catalyzed tandem reaction of 4-hydroxycoumarin with α,β-unsaturated carbonyl compounds in high yields. The catalytic reaction proceeded very smoothly under solvent-free conditions and showed high regioselectivity. The synthetic potential of this methodology was explored to 4-hydroxy-6-methyl-2-pyrone successfully
吡喃并[3,2- c ]香豆素的有效合成已通过三氟甲磺酸铜(II)催化4-羟基香豆素与α,β-不饱和羰基化合物的串联反应以高收率实现。在无溶剂条件下,催化反应进行得非常顺利,并具有很高的区域选择性。该方法的合成潜力已成功地探索为4-羟基-6-甲基-2-吡喃酮。
Synthesis and characterization of amino glucose-functionalized silica-coated NiFe<sub>2</sub>O<sub>4</sub> nanoparticles: a heterogeneous, new and magnetically separable catalyst for the solvent-free synthesis of pyrano[3,2-<i>c</i>]chromen-5(4<i>H</i>)-ones
A novel, efficient and one-pot multi-component procedure for the synthesis of simple pyrano[3,2-c]chromen-5(4H)-ones or pyrazolyl pyrano[3,2-c]chromen-5(4H)-ones via reaction of aryl aldehydes, acetophenones and 4-hydroxycoumarin promoted by amino glucose-functionalized silica-coated NiFe2O4 nanoparticles under solvent-free conditions without using any other harmful organic reagents was reported. The
一种新颖、高效的一锅法多组分合成方法,用于合成简单的吡喃并[3,2- c ]色烯-5(4 H )-酮或吡唑基吡喃并[3,2- c ]色烯-5(4 H) -酮据报道,在无溶剂条件下,不使用任何其他有害有机试剂,通过氨基葡萄糖功能化二氧化硅涂覆的NiFe 2 O 4纳米粒子促进芳基醛、苯乙酮和4-羟基香豆素的反应来制备()-酮。该纳米粒子的结构通过透射电子显微镜、X射线衍射和傅里叶变换红外光谱进行了表征。通过使用外部磁场,催化剂可以很容易地从反应混合物中分离出来,并且可以重复使用。该方法的其他优点包括所需产品纯度高、环境友好、反应时间短和后处理程序简单。