An asymmetric normal-electron-demand aza-Diels–Alder cycloaddition of 2-aryl-3H-indol-3-ones and 2,4-dienals was explored via trienaminecatalysis of a chiral secondary amine. Multifunctional tricyclic polyhydropyrido[1,2-a]indoles were efficiently constructed in good stereoselectivity (up to 92% ee, >19 : 1 dr).
通过三烯胺催化手性仲胺探索了2-芳基-3 H-吲哚-3-酮和2,4-二烯的不对称正电子需求的氮杂-Diels-Alder环加成反应。多功能三环多氢吡啶并[1,2- a ]吲哚以良好的立体选择性(高达92%ee,> 19:1 dr)被有效地构建。
Asymmetric Diels–Alder and Cascade Reaction of Quinone Imine Ketals and 2,4‐Dienals: Construction of Chiral Benzo[
<i>de</i>
]quinolone Derivatives
An asymmetricDiels–Alder cycloaddition reaction of quinoneimineketals and 2,4‐dienals has been investigated via trienamine catalysis of a secondary chiral amine. A series of chiral tricyclic benzo[de]quinolone derivatives were efficiently constructed in moderate to good yields and with high to excellent enantioselectivity after a cascade aromatization/intramolecular hemiaminal formation sequence
通过三烯胺催化仲手性胺研究了醌亚胺缩酮和2,4-二烯醛的不对称Diels-Alder环加成反应。在级联芳构化/分子间半缩醛形成序列(高达98%ee,> 19:1 dr)后,以中等至良好的收率和高至优异的对映选择性有效地构建了一系列手性三环苯并[ de ]喹诺酮衍生物。该方法和有用的产品支架可以在合成和医学领域中进一步使用。
Aminocatalytic asymmetric Diels–Alder reaction of phosphorus dienophiles and 2,4-dienals
functional group are valuable because of their wide application in biological studies and asymmetriccatalysis. Here we present an asymmetricDiels–Alder cycloaddition between phosphor-containing dienophiles and 2,4-dienals under the catalysis of chiral amine 1 via the intermediacy of trienamine species (trienaminecatalysis). A spectrum of densely functionalized phosphonocyclohexene derivatives was efficiently
Asymmetric Diels-Alder Cycloadditions of Trifluoromethylated Dienophiles Under Trienamine Catalysis
作者:Xin Yuan、Shan-Jun Zhang、Wei Du、Ying-Chun Chen
DOI:10.1002/chem.201600989
日期:2016.7.25
β‐Trifluoromethyl (CF3) enones were proved to act as good dienophiles in asymmetric normal‐electron‐demand Diels–Alder cycloadditions with 2,4‐dienals under trienamine catalysis with a chiral secondary amine. The sequential reductive amination transformations with benzylamine produced cis‐ and trans‐fused chiral trifluoromethylated octahydroisoquinolines in a diastereodivergent manner by using NaBH(OAc)3
An asymmetric exo-Diels–Alder reaction of α-methylene carbonyl compounds, generated in situ from stable methiodide salts of Mannich bases, with 2,4-dienals, has been developed through trienamine activation of a chiral secondary amine. A spectrum of spirocyclanes with high molecular complexity was efficiently constructed in moderate to excellent diastereo- and enantioselectivity.