Nondynamic and Dynamic Kinetic Resolution of Lactones with Stereogenic Centers and Axes: Stereoselective Total Synthesis of Herbertenediol and Mastigophorenes A and B
作者:Gerhard Bringmann、Thomas Pabst、Petra Henschel、Jürgen Kraus、Karl Peters、Eva-Maria Peters、David S. Rycroft、Joseph D. Connolly
DOI:10.1021/ja001455r
日期:2000.9.1
The stereoselective total synthesis of the sesquiterpene herbertenediol (3) and of its naturally occurring dimers, mastigophorenes A [(P)-1] and B [(M)-1], is described. Following the “lactone concept”, the configuration at the biaryl axis was atropo-divergently induced to be P or, optionally, M, by stereocontrolled reductive ring cleavage (diastereomeric ratio up to 97:3) of the configurationally
描述了倍半萜烯二醇 (3) 及其天然二聚体,mastigophorenes A [(P)-1] 和 B [(M)-1] 的立体选择性全合成。遵循“内酯概念”,联芳基轴上的构型通过构型不稳定的联合联芳基内酯前体 17 的立体控制还原环裂解(非对映异构体比例高达 97:3)被atropo-divergently 诱导为 P 或可选的 M使用氧杂硼烷-硼烷系统,通过动态动力学拆分。内酯偶联的机理考虑表明卤素取代基旁边的甲氧基的干扰,导致偶联产率从 39% 提高到 87%(得到内酯 37)。作为内酯方法的一种新的、同样高效的变体,我们首次报告了结构相关但中心手性的“脂肪族-芳香族”内酯 (rac)-10 的非动态动力学分辨率。其高效 (krel > 300) 对映异构体差异化 Corey-Ba...