Synthesis of Main-Chain Ionic Polymers of Chiral Imidazolidinone Organocatalysts and Their Application to Asymmetric Diels-Alder Reactions
作者:Naoki Haraguchi、Nagisa Takenaka、Aisyah Najwa、Yuta Takahara、Mah Kar Mun、Shinichi Itsuno
DOI:10.1002/adsc.201701016
日期:2018.1.4
Main‐chain ionic polymers incorporating chiral imidazolidinone moieties in the polymermainchain were successfully synthesized by the polyaddition reaction of a chiral imidazolidinone dimer with a disulfonic acid. The organocatalytic activities of these polymers were investigated in the asymmetric Diels–Alder reaction between trans‐cinnamaldehyde and 1,3‐cyclopentadiene. The catalytic performance
Highly Enantioselective Diels–Alder Reaction Catalyzed by Chiral Imidazolidinone
作者:Yongjiang Wang、Xiaoliang Xu、Wen Pei
DOI:10.1080/00397910802632571
日期:2009.5.7
Abstract New chiral imidazolidinone with an indole group was synthesized and used to catalyze the Diels–Alder reaction of α,β-unsaturated aldehyde with diene. High enantiomeric excesses and good yields were obtained. The reaction media were also surveyed. The best result in terms of enantioselectivity was achieved using acrolein and 2,3-dimethylbutdiene (up to 95% ee) in CH3OH/H2O.
Asymmetric organocatalysis on solid support combines the environmental advantages of metal-free catalysts and the ease of operation of solid-supported reagents. Enantioselective organocatalytic DielsAlder reactions have been demonstrated by two different solid-supported chiral organocatalysts. The catalysts are easy to recover and they can be reused. The reactivity of the catalyst can be tuned by changing
Flow Chemistry‐Enabled Divergent and Enantioselective Total Syntheses of Massarinolin A, Purpurolides B, D, E, 2,3‐Deoxypurpurolide C, and Structural Revision of Massarinolin A
作者:Ye‐Cheng Wang、Chengsen Cui、Mingji Dai
DOI:10.1002/anie.202109625
日期:2021.11.15
ring systems: a bicyclo[3.1.1]heptane, an oxaspiro[3.4]octane, and a dioxaspiro[4.4]nonane (oxaspirolactone). Herein, we report the first enantioselective total syntheses of massarinolin A, purpurolides B, D, E, and 2,3-deoxypurpurolide C. Our synthesis and computational analysis also led to a structural revision of massarinolin A. The divergent approach features an enantioselective organocatalyzed
Massarinolin A 和 purpurolides 是具有生物活性的佛手柑倍半萜烯,由多种具有挑战性的环系统缩合而成:双环 [3.1.1] 庚烷、oxaspiro[3.4] 辛烷和 dioxaspiro[4.4]nonane(oxaspirolactone)。在此,我们报告了 massarinolin A、purpurolides B、D、E 和 2,3-deoxypurpurolide C 的首次对映选择性全合成。我们的合成和计算分析也导致了 massarinolin A 的结构修正。不同的方法具有对映选择性有机催化Diels-Alder 反应在高 ee 中安装第一个手性中心,可扩展的流动光化学沃尔夫重排以构建关键的双环 [3.1.1] 庚烷,呋喃氧化环化形成氧螺内酯,后期烯丙基 CH 氧化,以及迈尔斯的
The First General Enantioselective Catalytic Diels−Alder Reaction with Simple α,β-Unsaturated Ketones
作者:Alan B. Northrup、David W. C. MacMillan
DOI:10.1021/ja017641u
日期:2002.3.1
The first general approach to enantioselectivecatalysis of the Diels−Alderreaction with simple ketone dienophiles has been accomplished. The use of iminium catalysis has enabled enantioselective access to a fundamental Diels−Alderreaction variant that has previously been unavailable using chiral Lewis acid catalysis. A new chiral amine catalyst has been developed that allows a variety of monodentate