Rapid Construction of Complex 2-Pyrrolines through Lewis Acid-Catalyzed, Sequential Three-Component Reactions via <i>in Situ</i>-Generated 1-Azaallyl Cations
作者:Marcel Schlegel、Christoph Schneider
DOI:10.1021/acs.orglett.8b01205
日期:2018.5.18
The first Sc(OTf)3-catalyzed dehydration of 2-hydroxy oxime ethers to generate benzylic stabilized 1-azaallyl cations, which are captured by 1,3-carbonyls, is described. A subsequent addition of primary amines in a sequential three-component reaction affords highly substituted and densely functionalized tetrahydroindeno[2,1-b]pyrroles as single diastereomers with up to quantitative yield. Thus, three
描述了2-羟基肟醚的第一Sc(OTf)3催化脱水以生成苄基稳定的1-氮杂烯丙基阳离子,其被1,3-羰基捕获。随后在顺序的三组分反应中添加伯胺可提供高取代度和高密度官能化的四氢茚并[2,1- b ]吡咯作为单一非对映异构体,并具有最高的定量收率。因此,在一锅操作中生成了三个新的σ键和两个相邻的四元立体生成中心。