Synthesis and photophysical properties of trichloro(fluoro)-Substituted 6-(3-oxo-1-(alk-1-en-1-yl)amino)coumarins and their 2,2-Difluoro-2H-1,3,2-oxazaborinin-3-ium-2-uide heterocycles
作者:Wilian C. Rosa、Inaiá O. Rocha、Bruna F. Schmitz、Melissa B. Rodrigues、Marcos A.P. Martins、Nilo Zanatta、Thiago V. Acunha、Bernardo A. Iglesias、Helio G. Bonacorso
DOI:10.1016/j.jfluchem.2020.109614
日期:2020.10
short study reports firstly the synthesis of a new series of six 1-substituted 6-((4,4,4-trihalo-3-oxo-alk-1-en-1-yl)amino)-2H-chromen-2-ones (4 and 5) and three 4- substituted 2,2-difluoro-3-(2-oxo-2H-chromen-6-yl)-6-(trichloromethyl)-2H-1,3,2-oxazaborinin-3-ium-2-uides (7), in which the selected 1- and 4-substituents are Me, Ph, and thien-2-yl. Both series (4 and 5) were synthesized from the reaction
这项简短的研究首先报道了一系列新的六个1-取代的6-(((4,4,4-trihalo-3-oxo-alk-1-en-1-yl)amino)-2 H -chromen- 2-ones(4和5)和三个4-取代的2,2-二氟-3-(2-oxo-2 H -chromen-6-yl)-6-(三氯甲基)-2 H -1,3,2 -oxazaborinin-3-ium-2-uides(7),其中选择的1-和4-取代基是Me,Ph和thien-2-yl。这两个系列(4和5)都是由6-胺香豆素(3)与(Z)-1,1,1-trihaloalk-3-en-2-ones(1和2)),产率为50–95%。随后,香豆素4和5与硼(BF 3 ·OEt 2)的反应仅产生相应的6-三氯甲基化杂环(7),产率为65-78%。研究了新香豆素衍生物的吸收和发射性质。紫外可见,发射荧光,量子产率和斯托克斯频移分析的结果表明,β-烯胺酮骨架与其取代基之间存在重要的关系。