本文中,我们报告了一种合成方法,该方法通过使用碳酸钠/过氧化氢,通过Algar-Flynn-Oyamada反应(AFO)对5-取代的黄酮醇进行了改进,具有中等至高收率的一系列5-取代的黄酮醇。阐明了AFO反应的机理。LCMS分析和原位1 H NMR分析表明,在碱性碱/过氧化物条件下,环氧化物参与了从查尔酮到黄酮醇和/或金酮的转化。
Synthesis and inhibitory activity against COX-2 catalyzed prostaglandin production of chrysin derivatives
摘要:
A series of chrysin derivatives were prepared and evaluated for their inhibitory activities of cyclooxygenase-2 catalyzed prostaglandin production. Chrysin derivatives were prepared from 2-hydroxyacetophenone, 2,4-dihydroxyacetophenone and 2,6-dihydroxyacetophenone in 2 to 4 steps, respectively. Methxoylated chrysin derivatives were converted to the corresponding hydroxylated chrysin derivatives by the reaction with BBr3 in good yields. The inhibitory activity of the chrysin derivatives against prostaglandin production from lipopolysaccharide-treated RAW 264.7 cells was measured. We found that chrysin derivatives with 3',4'-dichloro substituents (5e, 6e and 7e) exhibited good inhibitory activity of prostaglandin production. (C) 2004 Elsevier Ltd. All rights reserved.