Organocatalytic Asymmetric Synthesis of Chiral Pyrrolizines by Cascade Conjugate Addition−Aldol Reactions
作者:Ju-Yeon Bae、Hyo-Jun Lee、Seok-Ho Youn、Su-Hyun Kwon、Chang-Woo Cho
DOI:10.1021/ol101811c
日期:2010.10.1
N-centered heteroaromatic nucleophile for organocatalytic cascade reactions, pyrroles underwent the enantio- and diastereoselective organocatalytic cascade conjugate addition−aldol reactions of α,β-unsaturated aldehydes that afford the highly functionalized chiral pyrrolizines bearing three consecutive stereocenters in good yields, high enantioselectivities (90−98% ee), and excellent diastereoselectivities
作为用于有机催化级联反应的第一个以N为中心的杂芳族亲核试剂,吡咯经历了α,β-不饱和醛的对映异构和非对映选择性有机催化级联共轭加成-醛醇缩合反应,从而提供了高官能度的手性吡咯嗪,具有三个连续的立体中心,收率高,对映选择性(90-98%ee)和出色的非对映选择性(在所有情况下> 20:1 dr)。