Regioselective Control of the S<sub>N</sub>Ar Amination of 5-Substituted-2,4-Dichloropyrimidines Using Tertiary Amine Nucleophiles
作者:Mijoon Lee、Tomas Rucil、Dusan Hesek、Allen G. Oliver、Jed F. Fisher、Shahriar Mobashery
DOI:10.1021/acs.joc.5b01044
日期:2015.8.7
The SNAr reaction of 2,4-dichloropyrimidines, further substituted with an electron-withdrawing substituent at C-5, has selectivity for substitution at C-4. Here we report that tertiary amine nucleophiles show excellent C-2 selectivity. In situ N-dealkylation of an intermediate gives the product that formally corresponds to the reaction of a secondary amine nucleophile at C-2. This reaction is practical
在C-5处进一步被吸电子取代基取代的2,4-二氯嘧啶的S N Ar反应具有在C-4处取代的选择性。在这里,我们报告叔胺亲核试剂显示出色的C-2选择性。中间体的原位N-去烷基化得到的产物形式上对应于仲胺亲核体在C-2处的反应。该反应是实用的(在简单的反应条件下快速,对叔胺结构具有良好的通用性,并且具有中等至优异的产率),并且显着扩大了嘧啶结构的获得。