Formal [3 + 2] Reaction of α,α-Diaryl Allylic Alcohols with <i>sec</i>-Alcohols: Proceeding with Sequential Radical Addition/Migration toward 2,3-Dihydrofurans Bearing Quaternary Carbon Centers
作者:Weiming Hu、Song Sun、Jiang Cheng
DOI:10.1021/acs.joc.6b00643
日期:2016.5.20
3-dihydrofurans in moderate to excellent yields with good functional group tolerance. This procedure involves sequential radical addition, 1,2-aryl migration, and a dehydration process, where the migration of aryl with lower electron density is favored. Notably, cyclic reactions with sec-alcohols also ran smoothly, providing a novel method to access oxaspiro compounds.
已经开发出空前的TBHP促进的仲醇与α,α-二芳基烯丙基醇的正式[3 + 2]环化反应,导致2,3-二氢呋喃的产率中等至优异,且具有良好的官能团耐受性。该过程涉及顺序的自由基加成,1,2-芳基迁移和脱水过程,其中有利于电子密度较低的芳基迁移。值得注意的是,与仲醇的环状反应也进行得很顺利,这提供了一种新的方法来获得氧杂螺环化合物。