Studies on the Regioselective Nucleophilic Aromatic Substitution (S<sub>N</sub>Ar) Reaction of 2-Substituted 3,5-Dichloropyrazines
作者:Stephanie Scales、Sarah Johnson、Qiyue Hu、Quyen-Quyen Do、Paul Richardson、Fen Wang、John Braganza、Shijian Ren、Yadong Wan、Baojiang Zheng、Darius Faizi、Indrawan McAlpine
DOI:10.1021/ol4006695
日期:2013.5.3
Differences in regioselectivity were observed during the SNAr reaction of amines with unsymmetrical 3,5-dichloropyrazines. This study revealed that when the 2-position of the pyrazine was occupied with an electron-withdrawing group (EWG), nucleophilic attack occurred preferentially at the 5-position. When the 2-position was substituted with an electron-donating group (EDG), nucleophilic attack occurred
在S过程中观察到在区域选择性差异Ñ与不对称3,5- dichloropyrazines胺的Ar反应。这项研究表明,当吡嗪的2位被一个吸电子基团(EWG)占据时,亲核攻击优先发生在5位。当2位被供电子基团(EDG)取代时,亲核攻击优先发生在3位。报告了这些结果,并根据反应中心的Fukui指数对实验观察值进行了计算。