Synthesis of fluorescent 2,3,5,6-tetraalkynylpyridines by site-selective Sonogashira-reactions of 2,3,5,6-tetrachloropyridines
作者:Peter Ehlers、Andranik Petrosyan、Antje Neubauer、Timo Bröse、Stefan Lochbrunner、Tariel V. Ghochikyan、Ashot S. Saghyan、Peter Langer
DOI:10.1039/c4ob01292e
日期:——
6-tetraalkynylpyridines were prepared by tetra-fold Sonogashira reactions of the corresponding 2,3,5,6-tetrachloropyridines. 2,6-Dialkynyl-3,5-dichloropyridines were prepared by site-selective Sonogashira reactions from various 4-unsubstituted and 4-substituted tetrachloropyridines. Subsequent two-fold Sonogashira reactions of the products allowed for the synthesis of various 2,3,5,6-tetraalkynylpyridines containing
通过相应的2,3,5,6-四氯吡啶的四倍Sonogashira反应制备4-取代的2,3,5,6-四炔基吡啶。通过定点Sonogashira反应由各种4-未取代的和4-取代的四氯吡啶制备2,6-二炔基-3,5-二氯吡啶。产物的随后的两次Sonogashira反应允许合成含有不同炔基的各种2,3,5,6-四炔基吡啶。产品表现出令人感兴趣的UV / Vis和荧光特性。吸收带和发射带的位置可通过炔基取代基类型的系统变化和位于吡啶部分第4位的取代基的类型进行调节。