Iron(III)/Copper(II)-Cocatalyzed Cycloaddition/[3,3]-Rearrangement/N–O Bond Cleavage To Prepare Polysubstituted Pyrrolizines from <i>N</i>-Vinyl-α,β-Unsaturated Nitrones and Activated Alkynes
作者:Ning Zou、Ji-Wen Jiao、Yu Feng、Cheng-Xue Pan、Cui Liang、Gui-Fa Su、Dong-Liang Mo
DOI:10.1021/acs.orglett.8b03767
日期:2019.1.18
An efficient one-pot synthesis of polysubstituted pyrrolizines from N-vinyl-α,β-unsaturated nitrones and activated alkynes through iron(III)/copper(II)-cocatalyzed [3 + 2] cycloaddition/[3,3]-rearrangement and sequential N–O bond cleavage was developed. The reaction first underwent [3 + 2] cycloaddition and [3,3]-rearrangement to afford nine-membered N-heterocycles, and then a controlled N–O bond cleavage
通过铁(III)/铜(II)-共催化的[3 + 2]环加成/ [3,3]重排反应,由N-乙烯基-α,β-不饱和硝酮和活化炔烃有效地一锅合成多取代吡咯嗪进行了顺序的N–O键裂解。该反应首先进行[3 + 2]环加成和[3,3]重排,得到九元N-杂环,然后通过铁(III)/铜(II)控制九元环的N-O键断裂)助催化剂可提供吡咯烷嗪支架。通过使用醋酸铜(II)与手性PyBox配体结合,首次实现了九元环化合物的动力学拆分。