Synthesis and biological evaluation of flavonoids as vasorelaxant agents
摘要:
Several 5,7-dihydroxyflavone and quercetin 3-O-glycosides have been synthesized and evaluated for vasorelaxant activity. A logP-activity relationship amongst flavonoids was suggested. (C) 2004 Elsevier Ltd. All rights reserved.
Solvent-Free Synthesis of Functionalized Flavones under Microwave Irradiation
作者:Julio A. Seijas、M. Pilar Vázquez-Tato、Raquel Carballido-Reboredo
DOI:10.1021/jo048685z
日期:2005.4.1
Eco-friendly direct solvent-freesynthesis of flavones is achieved by microwaveirradiation of phloroglucinol and β-ketoesters. Heating with microwaves versus under classical conditions was shown to be higher yielding, cleaner, and faster. The reaction goes through a cycloaddition of an α-oxo ketene intermediate followed by an uncatalyzed thermal Fries rearrangement.
5-carbonyl-4-hydroxybenzofurans via a phenol-directed intramolecular Friedel–Crafts reaction. This synthetic method was applied for the total synthesis of furanoflavones. Experimental studies and density functional theory calculations suggest that hydrogen bond interactions between the phenolic hydroxy group and the scandium complex realize regioselective intramolecular cyclization.