Stereoselective radical-mediated cyclization of norephdrine derived α-iodoamides: synthesis of enantiopure pyrrolidines and trandition state modelling1
作者:Laura Belvisi、Cesare Gennari、Giovanni Poli、Carlo Scolastico、Barbara Salom、Marco Vassallo
DOI:10.1016/s0040-4020(01)88474-x
日期:1992.1
Radical-mediated cyclization of norephedrine derived α-iodoamides 1 was found to be highly stereoselective (≥97:3) favouring diastereoisomer 2. Bicyclic lactams 2 were transformed in high yields into enantiomerically pure pyrrolidines 10. Transition state modelling with a force developed ad hoc nicely predicts the stereochemical results.
自由基介导的去甲肾上腺素衍生的α-碘酰胺1的环化具有高度立体选择性(≥97:3),有利于非对映异构体2。双环内酰胺2以高收率转化为对映体纯的吡咯烷10。临时开发的力进行的过渡态建模可以很好地预测立体化学结果。