Organocatalytic Enantioselective Michael–Michael–Michael–Aldol Condensation Reactions: Control of Five Stereocenters in a Quadruple-Cascade Asymmetric Synthesis of Highly Functionalized Hexahydrophenanthrenes
作者:Arun Raja、Bor-Cherng Hong、Gene-Hsiang Lee
DOI:10.1021/ol502821e
日期:2014.11.7
A cascade organocatalysis has been developed for the enantioselective synthesis of a highly functionalized hexahydrophenanthrene-2-carbaldehyde containing five contiguous stereogenic centers with high diastereoselectivity and high enantioselectivity (>99% ee). The one-pot method comprises a cascade of organocatalytic Michael–Michael–Michael–aldol reactions of 2-methyl-1,5-dinitro-3-((E)-2-nitrovinyl)benzene
已开发出一种级联有机催化剂,用于对映选择性合成高度官能化的六氢菲-2-甲醛,其中含有五个具有高非对映选择性和高对映选择性(> 99%ee)的连续立体中心。一锅法包括2-甲基-1,5-二硝基-3-((E)-2-硝基乙烯基)苯与α,β-不饱和醛类(例如,肉桂醛)。通过适当的衍生物的X射线分析来确认产物的结构和绝对构型。