Stereocontrolled Synthesis of <i>Z</i>-Dienes via an Unexpected Pericyclic Cascade Rearrangement of 5-Amino-2,4-pentadienals
作者:Sarah E. Steinhardt、Joel S. Silverston、Christopher D. Vanderwal
DOI:10.1021/ja8028125
日期:2008.6.18
Donor-acceptor dienes known as Zincke aldehydes, which derive readily from the ring-opening reactions of pyridinium salts with secondary amines, undergo a fascinating thermal rearrangement reaction to afford Z-alpha,beta,gamma,delta-unsaturated amides with excellent stereoselectivity. Efficient, stereocontrolled access to Z-trisubstituted alkenes with two different substitution patterns is possible
被称为锌醛的供体 - 受体二烯很容易从吡啶盐与仲胺的开环反应中衍生出来,经过引人入胜的热重排反应以提供具有优异立体选择性的 Z-α、β、γ、δ-不饱和酰胺。从适当取代的吡啶衍生物开始,可以通过三个步骤有效地、立体控制地获得具有两种不同取代模式的 Z-三取代烯烃。初步研究表明,酰胺和单取代的烯烃末端都可以选择性地官能化。易于获取、范围的普遍性和容易的产品操作使该过程对复杂多烯的合成具有吸引力。