Highly Efficient Hydrogen-Bonding Catalysis of the Diels–Alder Reaction of 3-Vinylindoles and Methyleneindolinones Provides Carbazolespirooxindole Skeletons
作者:Bin Tan、Gloria Hernández-Torres、Carlos F. Barbas
DOI:10.1021/ja203812h
日期:2011.8.17
Carbazolespirooxindole derivatives were synthesized in a high-yielding, atypically rapid, stereocontrolled Diels-Alderreaction catalyzed by a C(2)-symmetric bisthiourea organocatalyst. Simple precursors and mild conditions were used to construct carbazolespirooxindole derivatives with high enantiopurity and structural diversity under H-bonding catalysis. The practical approach recycles the organocatalyst
Asymmetric Diels-Alder Reactions of Vinylindoles Using Organocatalysis
作者:Luca Bernardi、Alfredo Ricci、Claudio Gioia
DOI:10.1055/s-0029-1217046
日期:2010.1
The different behavior of 3- and 2-vinylindoles in Diels-Alder cycloaddition reactions in the presence of bifunctional hydrogen bond donor organocatalysts is described. asymmetric catalysis - Diels-Alderreactions - kinetic resolution - organocatalysis - vinylindoles
A highly efficient catalytic asymmetric Diels-Alderreaction between 3-vinylindoles and methyleneindolinones has been achieved using chiral N,N'-dioxide-Ni(II) complexes as the catalysts. A wide variety of substrates were readily tolerated, generating exclusively the corresponding exo-carbazolespirooxindole derivatives in excellent yields with high enantiomeric excesses (up to 98% yield, >99 : 1 d
Organocatalytic Asymmetric Synthesis of Tetracyclic Pyridocarbazole Derivatives by Using a Diels-Alder/aza-Michael/Aldol Condensation Domino Reaction
作者:Dieter Enders、Céline Joie、Kristina Deckers
DOI:10.1002/chem.201302127
日期:2013.8.12
Triple domino: An organocatalyticasymmetric triple cascade reaction to form tetracyclic pyridocarbazole derivatives is described. The new protocol includes a Diels–Alder/aza‐Michael/aldol condensation sequence. Up to six stereogenic centers are formed with excellent diastereo‐ and enantioselectivity. IM = iminium activation; EN = enamine activation.
Diastereo- and Enantioselective Construction of Dihydrobenzo[<i>e</i>]indole Scaffolds via Catalytic Asymmetric [3 + 2] Cycloannulations
作者:Can Li、Dan-Ni Xu、Chun Ma、Guang-Jian Mei、Feng Shi
DOI:10.1021/acs.joc.8b01217
日期:2018.8.17
The first catalytic asymmetric construction of chiral dihydrobenzo[e]indole scaffolds has been established in a highly diastereo- and enantioselective mode (30 examples, up to 99% yield, >95:5 dr, >99% ee), which makes use of chiral phosphoric acid-catalyzed [3 + 2] cycloannulations of azonaphthalene derivatives with 3-vinylindoles. This reaction also represents the first catalytic asymmetric cycloannulation
手性二氢苯并[ e ]吲哚骨架的第一个催化不对称结构已经建立在高度非对映和对映选择性的模式下(30个实例,产率高达99%,> 95:5 dr,> 99%ee),它利用了手性磷酸与3-乙烯基吲哚的偶氮萘衍生物的[3 + 2]环环化反应。该反应也代表了氮杂萘衍生物与烯烃的首次催化不对称环环化,这不仅为构建对映体富集的二氢苯并[ e ]吲哚骨架提供了有用的方法,而且还促进了氮杂萘衍生物催化不对称反应的化学反应。