2-Aryl-5-amino-1,2,3-triazoles: New effective blue-emitting fluorophores
摘要:
The synthesis of a new series of 2-aryl-5-amino-1,2,3-triazole derivatives is reported. The photochemical properties of these new fluorophores were studied both experimentally and using theoretical models. The compounds were found to be fluorescent, with Stokes shifts ranging from 40 nm (2494 CM-1) to 140 nm (9461 cm(-1)) and quantum yield values between 0.004 and 0.996. The fluorescence of the 1,2,3-triazoles was highly structure dependent and could be tuned by variation of the substituents at the C-4 and C-5 atoms of triazole ring and by the electronic and spatial effect of substituents within the aromatic cycle. Photophysical studies showed moderate changes in the fluorescence quantum yields depending on the solvent polarity. The UV-Vis spectra calculations employing the time-dependent density functional theory (TD-DFT) are in good agreement with the experimental data. The favourable photophysical properties of the studied compounds and their facile and high-yielding synthesis make them excellent candidates for commercial application as fluorescent tags. (C) 2016 Elsevier Ltd. All rights reserved.
Synthesis of 2-Aryl-1,2,3-triazoles by Oxidative Cyclization of 2-(Arylazo)ethene-1,1-diamines: A One-Pot Approach
作者:Kseniya D. Gavlik、Svetlana G. Lesogorova、Ekaterina S. Sukhorukova、Julia O. Subbotina、Pavel A. Slepukhin、Enrico Benassi、Nataliya P. Belskaya
DOI:10.1002/ejoc.201600256
日期:2016.5
A one-pot approach for the synthesis of 2-aryl-5-amino-1,2,3-triazoles is reported. This approach involves a tandem nucleophilic addition of alkylamines to hydrazonoyl cyanides and in situ oxidative cyclization of the resulting 2-(arylazo)ethene-1,1-diamines in the presence of copper(II) acetate and air. The described one-pot procedure is characterized by good yields, excellent selectivity, methodical
报道了一种用于合成 2-芳基-5-氨基-1,2,3-三唑的一锅法。该方法涉及将烷基胺串联亲核加成到腙酰氰化物,并在乙酸铜 (II) 和空气存在下原位氧化环化所得 2-(芳基偶氮) 乙烯-1,1-二胺。所描述的一锅法的特点是产量高、选择性好、方法简单,并且使用容易获得的化学品。该方法应用于2-芳基-1,2,3-三唑的克级合成。