Synthesis, regioselectivity, and DFT analysis of new antioxidant pyrazolo[4,3-c]quinoline-3,4-diones
作者:Isabelle Tomassoli、Guillaume Herlem、Fabien Picaud、Mohamed Benchekroun、Oscar M. Bautista-Aguilera、Vincent Luzet、María-Luisa Jimeno、Tijani Gharbi、Bernard Refouvelet、Lhassane Ismaili
DOI:10.1007/s00706-016-1660-7
日期:2016.6
AbstractThe condensation of hydrazine, N-methylhydrazine, and N-phenylhydrazine with ethyl 4-chloro-2-oxo-1,2-dihydroquinoline-3-carboxylate derivatives has been investigated. As a result, 12 new antioxidant pyrazolo[4,3-c]quinolin-3,4-diones were obtained with good to high yields. When two cross-products could be possible, only one isomer bearing the methyl or the phenyl group at the N1 position is
摘要已经研究了肼,N-甲基肼和N-苯基肼与4-氯-2-氧代-1,2-二氢喹啉-3-羧酸乙酯衍生物的缩合。结果,以良好至高产率获得了12种新的抗氧化剂吡唑并[4,3 - c ]喹啉-3,4-二酮。当可能产生两种交叉产物时,仅分离出一个在N1位置带有甲基或苯基的异构体,并使用1D和2D NMR技术,FT-IR和燃烧分析对其进行明确表征。在皮尔逊硬质软酸碱骨架中进行了反应机理的DFT分析,确认了所观察到的吡唑并[4,3- c]的结构。]喹啉-3,4-二酮。这些计算表明,与其可能的区域异构体相比,合成的吡唑并[4,3 - c ]喹啉-3,4-二酮具有良好的动力学控制。 图形概要