A Versatile Stereocontrolled Approach to Chiral Tetrahydrofuran and Tetrahydropyran Derivatives by Use of Sequential Asymmetric Horner−Wadsworth−Emmons and Ring-Closure Reactions
作者:Lauri Vares、Tobias Rein
DOI:10.1021/jo0259111
日期:2002.10.1
use of an asymmetric Horner-Wadsworth-Emmons reaction and a cyclization step is presented. The approach is both stereochemically and structurally versatile since three different cyclization methods can be employed starting from the same HWE product: (i) palladium-catalyzed substitution, (ii) hetero-Michael addition, or (iii) epoxide opening. The asymmetric HWE reaction controls the absolute configuration
提出了一种基于顺序使用不对称的霍纳-沃兹沃思-埃蒙斯反应和环化步骤的手性四氢呋喃和四氢吡喃衍生物的方法。该方法在立体化学和结构上都是通用的,因为可以从相同的HWE产品开始使用三种不同的环化方法:(i)钯催化的取代,(ii)杂-迈克尔加成,或(iii)环氧开放。不对称的HWE反应控制最终产物的绝对构型,而相对构型则受HWE反应中几何选择性和相应环化方法的立体化学的综合影响控制。