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
Synthesis of new pyrazolo[4,3-<i>c</i>]quinolin-3-one derivatives and some oxazolo[4,5-<i>c</i>]quinoline-2,4-diones
作者:Lhassane Ismaïli、Bernard Refouvelet、Jean François Robert
DOI:10.1002/jhet.5570360323
日期:1999.5
The new pyrazolo[4,3-c]quinolin-3-one derivatives 3a-c and 6a-c were prepared by the following three steps: first the preparation of ethyl 4-hydroxyquinoline-3-carboxylate derivatives1 and 4 by reaction of isatoic anhydrides and ethyl malonate and ethyl acetoacetate respectively, then chloration of 1 and 4 with phosphorus oxychloride to give 2 and 5 and finally the condensation of 2 and 5 with hydrazine
通过以下三个步骤制备新的吡唑并[4,3 - c ]喹啉-3-酮衍生物3a-c和6a-c:首先通过与下列物质的反应制备4-羟基喹啉-3-羧酸乙酯衍生物1和4。分别用二酸酐,丙二酸乙酯和乙酰乙酸乙酯,然后用氯氧化磷将1和4氯化,得到2和5,最后将2和5与肼及其衍生物缩合。此外,成功合成了恶唑并[4,5 - c ]喹啉-2,4-二酮9a-f 被报道。
4-Hydroxy-2-quinolones 141. Synthesis and structure of 5R-3-hydroxy-1,5-dihydropyrazolo[4,3-c]quinolin-4-ones
作者:I. V. Ukrainets、V. V. Kravtsova、A. A. Tkach、G. Sim
DOI:10.1007/s10593-008-0032-6
日期:2008.2
Treatment of 1R-4-chloro-3-ethoxycarbonyl-2-oxo-1,2-dihydroquinolines with p-toluenesulfonylhydrazide in refluxing ethanol and in the presence of triethylamine gives the 3-hydroxy-5R-1,5-dihydropyrazolo[4,3-c]quinolin-4-ones. The possible mechanism of formation, features of the steric structure of the synthesized compounds, and their NMR and mass spectra are discussed.
4-Hydroxyquinolones-2
作者:I. V. Ukrainets、P. A. Bezuglyi、V. I. Treskach、M. Yu. Kornilov、A. V. Turov、A. I. Maslennikov、S. V. Gladchenko、V. I. Krivobok