A reaction of pyridinium perfluorophenacylide generated from pyridinium salt 1 with 1,1-dicyanoethylene derivatives 2 produced unusual products 3, which have an ylide structure with a cyano group at the C2 and a cis-acrylonitrile moiety at the o-position of the perfluorophenyl group. A plausible mechanism involving intramolecular aromatic nucleophilic substitution and 1,3-migration of the cyano group is proposed for this reaction.
由
吡啶鎓盐 1 生成的
全氟苯甲酰基
吡啶鎓与 1,1-二
氰基
乙烯衍
生物 2 反应生成不寻常的产物 3,其具有叶立德结构,C2 处有
氰基,
全氟苯基的邻位有顺式
丙烯腈部分。该反应提出了一种涉及分子内芳香亲核取代和
氰基 1,3-迁移的合理机制。