作者:J.B Sweeney、Ali Tavassoli、Neil B Carter、Jerome F Hayes
DOI:10.1016/s0040-4020(02)01397-2
日期:2002.12
The [2,3]-sigmatropic rearrangements of ammonium ylids derived from 1,2,5,6-tetrahydropyridine have been studied: both rearrangement and elimination processes are observed, with rearrangement favoured when aprotic solvents are used in the reaction. The presence of anion-stabilizing substituents on the nucleophilic carbon atom of the intermediate ylid species involved in the tranformation also engenders
已经研究了由1,2,5,6-四氢吡啶衍生的铵基的[2,3]-σ重排:观察到重排和消除过程,当在反应中使用非质子溶剂时,重排更为有利。参与转化的中间碘分子的亲核碳原子上存在稳定阴离子的取代基,也会引起重排。当存在某些芳基取代基或两个阴离子稳定基团时,未观察到消除,并且供电子性的羟基取代基延迟重排,同时增强了消除作用。