The Synthesis of<i>trans</i>-Perhydroindolic Acids and their Application in Asymmetric Domino Reactions of Aldehyde Esters with β,γ-Unsaturated α-Keto Esters
作者:Jiefeng Shen、Delong Liu、Qianjin An、Yangang Liu、Wanbin Zhang
DOI:10.1002/adsc.201200456
日期:2012.11.26
addition/cyclization reactions of aldehyde esters with β,γ-unsaturated α-keto esters. They proved to have excellent catalytic behavior, allowing for the synthesis of multi-substituted, enantiomerically enriched hemiacetal esters. Under optimal conditions (using 10 mol% catalyst loading), a series of β,γ-unsaturated α-keto esters was examined with up to 99% de, ee and yield, respectively. Additionally, the
(2 S,3 aR,7 aS)-全氢吲哚酸是合成trandolapril的关键中间体,及其反式异构体也很容易制备。这些脯氨酸样分子是在于它们含有一个刚性的双环结构独特,具有两个氢原子的反式在桥头碳原子上彼此连接。这些分子已成功用作醛酯与β,γ-不饱和α-酮酯的不对称多米诺·迈克尔加成/环化反应中的手性有机催化剂。它们被证明具有出色的催化性能,可以合成多取代,对映异构体富集的半缩醛酯。在最佳条件下(使用10 mol%的催化剂负载),检查了一系列β,γ-不饱和α-酮酸酯,分别具有高达99%的de,ee和收率。另外,对映体富集的半缩醛酯可以容易地转化为其相应的生物活性吡喃并[2,3- b ]吡喃(具有多取代的双环骨架)。