Neighboring Group Participation of Nitrogen Cation to Form an Unusual Six-Membered Ring Intermediate During Oxime Rearrangement
作者:Tomohiro Fujino、Tadashi Hyodo、Yuko Otani、Kentaro Yamaguchi、Tomohiko Ohwada
DOI:10.1021/acs.joc.2c01098
日期:2022.10.7
solution by means of 1H NMR supported the existence of the 6-membered cation intermediate. Density functional theory (DFT) calculations also supported the intervention of this intermediate in the rearrangement and indicated that it has a planar structure stabilized by electron delocalization.
尽管有机化学中有 6 元环过渡结构的特权,但涉及 6 元环结构的相邻基团参与很少见。我们研究了具有相邻基团的氮阳离子参与的 6 元环状中间体在环酯茚满酮肟的同步迁移中的推定作用。通过1 H NMR直接观察溶液中的peri-甲酯-亚胺中间体支持了 6 元阳离子中间体的存在。密度泛函理论 (DFT) 计算也支持该中间体在重排中的干预,并表明它具有通过电子离域稳定的平面结构。