Rapid synthesis of 4-alkynyl coumarins and tunable electronic properties of emission solvatochromic fluorophores
作者:Julian Papadopoulos、Thomas J.J. Müller
DOI:10.1016/j.dyepig.2019.03.038
日期:2019.7
Novel fluorescent 4-alkynyl coumarins were rapidly and efficiently synthesized by Sonogashira coupling of readily accessible coumaryl triflates. The photophysical properties of the predominantly highly fluorescent compounds were experimentally studied by absorption and fluorescence spectroscopy and their electronic structure was rationalized by DFT and TD-DFT calculations using the PBEh1PBE functional
Copper-free Sonogashira reactions of 4-hydroxycoumarins with alkynes
作者:Yong Luo、Jie Wu
DOI:10.1016/j.tet.2009.06.089
日期:2009.8
The palladium-catalyzed direct coupling reactions of 4-hydroxycoumarins with various alkynes under copper-free conditions are described. This transformation is highly effective under mild conditions and the desired products are obtained in good yields. (C) 2009 Elsevier Ltd. All rights reserved.
Three-Component Synthesis and Photophysical Properties of Novel Coumarin-Based Merocyanines
作者:Julian Papadopoulos、Kay Merkens、Thomas J. J. Müller
DOI:10.1002/chem.201704912
日期:2018.1.19
Novel E‐configured coumarin‐based merocyanines were efficiently synthesized by a one‐pot, three‐component Sonogashira coupling–Michael addition starting from triflyl coumarins, terminal alkynes and secondary amines. The photophysicalproperties of the synthesized yellow to orange merocyanines were studied by UV/Vis and fluorescence spectroscopy and rationalized by Hammett–Taft correlations and DFT
新型E-配置的基于香豆素的部花菁是通过三锅豆香豆素,末端炔烃和仲胺开始的一锅,三组分Sonogashira偶联-迈克尔加成反应而有效合成的。通过紫外/可见光和荧光光谱研究了合成的黄色至橙色花青的光物理性质,并通过Hammett-Taft相关性和DFT和TD-DFT计算对其进行了合理化。大多数化合物在溶液中仅发出微弱的荧光。但是,对两种化合物的聚集行为进行了更详细的研究。R 2 = H和NR 2 3 =吡咯烷基的系统显示出聚集诱导的发射,在甲醇中水含量为40–60%时,发色团带有R 2= p- Me 2 NC 6 H 4和NR 2 3 =吗啉基显示出可观的聚集诱导的发射增强,同时随着THF中水含量的增加而发生红移。