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 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。
Efficient Route to Highly Functionalized Chalcone-Based Pyranocoumarins via Iodine-Promoted Michael Addition Followed by Cyclization of 4-Hydroxycoumarins
作者:Naseem Ahmed、B. Venkata Babu
DOI:10.1080/00397911.2012.763099
日期:2013.11.17
Abstract Molecular iodine is used as an efficient promoter in the regioselective synthesis of highlyfunctionalized chalcone-based pyranocoumarin derivatives using 4-hydroxycoumarin in acetic acid solvent at 100 °C. Under optimized reaction conditions, our protocol (Michael addition followed by intermolecular cyclization) has tolerance for many functional groups and gave products in good to excellent
Bi(OTf)3-catalyzed solvent-free synthesis of pyrano[3,2-c]coumarins through a tandem addition/annulation reaction between chalcones and 4-hydroxycoumarins
作者:Mukut Gohain、Johannes H. van Tonder、Barend C.B. Bezuidenhoudt
DOI:10.1016/j.tetlet.2013.05.008
日期:2013.7
A Bi(OTf)3-catalyzedtandemaddition/annulation reaction is described in order to synthesize pyrano[3,2-c]coumarins under solvent-free conditions. Substituted/unsubstituted chalcones were conveniently condensed with various 4-hydroxycoumarins by means of this environmentally benign method which produces water as the only side product.
描述了Bi(OTf)3催化的串联加成/环合反应,以便在无溶剂条件下合成吡喃并[3,2- c ]香豆素。借助于这种环境友好的方法,取代的/未取代的查耳酮方便地与各种4-羟基香豆素缩合,该方法产生水作为唯一的副产物。
Soluble Glass, an Efficient Promoter for the Cascade Addition-Cyclization Reaction of 4-Hydroxycoumarins to Chalcone Derivatives
(2021). Soluble Glass, an Efficient Promoter for the Cascade Addition-Cyclization Reaction of 4-Hydroxycoumarins to Chalcone Derivatives. Organic Preparations and Procedures International: Vol. 53, No. 1, pp. 52-58.