Possible Reason for the Unusual Regioselectivity in Nucleophilic Ring Opening of Trisubstituted Aziridines under Mildly Basic Conditions
作者:Brandon T. Kelley、Patrick Carroll、Madeleine M. Joullié
DOI:10.1021/jo5006685
日期:2014.6.6
3-Trisubstituted aziridines are known to undergo ring opening at the more substituted carbon under mildly basic conditions. However, the reason for the formation of the more sterically encumbered product has never been examined. Several trisubstituted aziridines, with different substitution patterns at the C-2 and C-3 carbons, were synthesized to change the electronics of the aziridine ring system. These
已知2,2,3-三取代的氮丙啶在温和的碱性条件下在取代度更高的碳上发生开环。但是,从来没有研究过形成空间上较多的产物的原因。合成了在C-2和C-3碳原子上具有不同取代方式的几种三取代的氮丙啶,以改变氮丙啶环系统的电子学。这些变化对开环反应的区域选择性没有影响。使用B3LYP / 6-31G * DFT基组,确定了在取代度更高的碳处的开环转变态以比取代度更低的碳处的转变态更低的能量进行。