Activation of chlorine and fluorine by a phenylazo group towards nucleophilic aromatic substitution. Regioselective preparation of polysubstituted anilines
作者:Anna Fryszkowska、Robert W. Tilford、Fengli Guo、Piotr Kaszynski
DOI:10.1016/j.tet.2005.01.023
日期:2005.2
A phenylazo group was used for selective activation of ortho fluorine and chlorine atoms towards nucleophilic aromatic substitution with the propanethiolate anion. This enabled a regioselective synthesis of three substituted 4-alkoxyanilines. The regioselectivity of substitution was confirmed by comparison of experimental NMR chemical shifts with empirically predicted values. The observed reactivity
使用苯基偶氮基团将邻氟和氯原子选择性活化为丙硫醇盐阴离子进行亲核芳族取代。这实现了三个取代的4-烷氧基苯胺的区域选择性合成。通过将实验NMR化学位移与经验预测值进行比较,可以确定取代的区域选择性。在取代基效应的背景下讨论了所观察到的底物的反应性。