Organocatalytic Enantioselective Synthesis of Highly Functionalized Polysubstituted Pyrrolidines
作者:Nerea Ruiz、Efraím Reyes、Jose L. Vicario、Dolores Badía、Luisa Carrillo、Uxue Uria
DOI:10.1002/chem.200800788
日期:2008.10.20
adducts. 3,4-Disubstituted pyrrolidines have been obtained in a single step by Zn-mediated chemoselective reduction of the nitro group followed by intramolecular reductive amination, and trisubstituted homoproline derivatives have been prepared by means of an olefination reaction and a cascade process involving chemoselective reduction of the nitro group followed by a fully diastereoselective intramolecular
已经详细研究了将不同的醛有机催化共轭加成到β-硝基丙烯醛二甲基乙缩醛中,以高收率和高立体选择性产生相应的高度官能化的硝基醛。这些转化是通过使用1:1比例的容易获得的起始原料以及催化剂负载量为10 mol%的市售催化剂来实现的。此外,已经设计了一种非常短而有效的方案,用于从获得的迈克尔加合物开始制备高度对映体富集的吡咯烷,其包含两个或三个连续的立体中心。通过Zn介导的硝基化学选择性还原硝基,然后进行分子内还原胺化,一步即可获得3,4-二取代的吡咯烷,