Synthesis and Photophysical Characterization of 2,3-Dihydroquinolin-4-imines: New Fluorophores with Color-Tailored Emission
作者:Chih-Hung Chou、Basker Rajagopal、Chien-Fu Liang、Kuan-Lin Chen、Dun-Yuan Jin、Hsing-Yin Chen、Hsiu-Chung Tu、Yu-Ying Shen、Po-Chiao Lin
DOI:10.1002/chem.201703998
日期:2018.1.24
In this study, a series of variously substituted 2,3‐dihydroquinolin‐4‐imines (DQIs) were synthesized from N‐substituted propargylanilines by copper(I)‐catalyzed annulation. The approach adopted in this study under mild, effective conditions exhibited broad substrate tolerance, particularly for functional groups substituted on anilines. Most of the DQI derivatives synthesized under optimal conditions
在这项研究中,由N-取代的炔丙基苯胺通过铜(I)催化的环合反应合成了一系列不同取代的2,3-二氢喹啉-4-亚胺(DQI)。本研究在温和有效的条件下采用的方法表现出广泛的底物耐受性,尤其是对苯胺上取代的官能团。在最佳条件下合成的大多数DQI衍生物均以63-88%的良好分离产率获得。由此获得的2,3-二氢喹啉亚胺很容易转化为重要的结构,如2,3-二氢喹诺酮和四氢苯并二氮杂-5-1-酮,证实了该策略在构建各种杂环中的重要性。令人惊讶的是,如此获得的2,3-二氢喹啉亚胺显示出明亮的荧光,量子产率高达66%。为了了解DQI系统的激发态性质,进行了密度泛函理论(DFT)和时变DFT(TD-DFT)计算。因此,设计并合成了量身定制的DQI衍生物,与7-甲氧基取代的DQI相比,该衍生物在C-6位置带有甲氧基,在C-7位置带有乙酰氧基,在559 nm处有红移发射。用五个控制分子对DQI结构及其光物理性质进行