A series of new coumarin derivatives 4 containing a 4-arylbut-3-en-2-one moiety were synthesized by condensation of 3-acetylcoumarin 1 with aryl aldehydes 2 in chloroform in the presence of piperidine. The interactions of 3-formyl-4-chlorocoumarin (3) with nitrogen-containg nucleophiles leading to the corresponding substituted chromen-[4,3-c]pyrazol-4-ones 5 are described. The structures of the obtained compounds were established on the basis of 1D NMR, 2D NMR and IR and further the compounds were evaluated for possible antioxidant activities. The coumarinic chalcone 4a has been found to be the most active (IC50 = 2.07 μM) in this study.
在
哌啶存在下,3-乙酰基
香豆素 1 与芳基醛 2 在
氯仿中缩合,合成了一系列含有 4-芳基丁-3-烯-2-酮分子的新型
香豆素衍
生物 4。文中描述了 3-甲酰基-4-
氯香豆素(3)与含氮亲核物的相互作用,从而得到相应的取代色烯-[4,3-c]
吡唑-4-酮 5。根据一维核磁共振、二维核磁共振和红外光谱确定了所获化合物的结构,并进一步评估了这些化合物可能具有的抗氧化活性。研究发现,
香豆素查尔酮 4a 的活性最高(IC50 = 2.07 μM)。