The three-component reaction between a nitrobenzene, an aldehyde, and a dienophile in the presence of iron powder as a reductant and montmorillonite K10 as a catalyst in aqueous citric acid delivers the products of an aza-Diels–Alder (Povarov) reaction with high endo-selectivity and yields up to 99%.
Inverse Electron Demand Diels-Alder Reactions of Heterodienes Catalyzed by Potassium Hydrogen Sulfate: Diastereoselective, One-Pot Synthesis of Pyranobenzopyrans, Furanobenzopyrans and Tetrahydroquinolines Derivatives
作者:Paramasivan T. Perumal、R. Senthil Kumar、Rajagopal Nagarajan
DOI:10.1055/s-2004-822332
日期:——
Potassiumhydrogensulfate catalyzes the one-pot three components coupling of aldehydes, anilines, and electron rich dienophiles such as dihydropyran, dihydrofuran, ethyl vinylether, and cyclopentadiene. With o-hydroxybenzaldehyde, the reaction probably proceeds through the formation of o-quinonemethide intermediate, which subsequently undergoes cycloaddition with cyclic and acyclic enol ethers leading
Indium trichloride (InCl3)catalyzed imino Diels-Alder reactions: An efficient synthesis of cyclopentaquinolines, azabicyclooctanones and azabicyclononanones
作者:Govindarajulu Babu、Paramasivan T. Perumal
DOI:10.1016/s0040-4020(97)10370-2
日期:1998.2
Anhydrous indiumtrichloride (InCl3) is found to catalyze the imino Diels-Alderreactions of Schiff's bases with cyclopentadiene, cyclohexen-2-one and cyclohepten-2-one which resulted in facile synthesis of cyclopentaquinolines, azabicyclooctanones and previously unreported series of azabicyclononanones.
作者:A. G. Tolstikov、R. G. Savchenko、D. V. Nedopekin、S. R. Afon’kina、E. S. Lukina、V. N. Odinokov
DOI:10.1007/s11172-011-0024-z
日期:2011.1
aldehyde, and cyclopentadiene with subsequent N-trifluoroacetylation leads to 4- and 4,8-substituted N-trifluoroacetyl-3a,4,5,9b-tetrahydro-3H-cyclopenta[c]quinolines. Ozonation of the double bond in the latter produced the corresponding isomeric stable ozonides having (1R*,4S*,5aR*,6S*,11bR*)-configuration and differing in inversion at the carboxamide nitrogen atom.
Study and application of graphene oxide in the synthesis of 2,3-disubstituted quinolines <i>via</i> a Povarov multicomponent reaction and subsequent oxidation
作者:Samantha Caputo、Alessandro Kovtun、Francesco Bruno、Enrico Ravera、Chiara Lambruschini、Manuela Melucci、Lisa Moni
DOI:10.1039/d2ra01752k
日期:——
The carbocatalyzed synthesis of 2,3-disubstituted quinolines is disclosed. This process involved a three-component Povarov reaction of anilines, aldehydes and electron-enriched enol ethers, which gave the substrate for the subsequent oxidation. Graphene oxide (GO) was exploited as a heterogeneous, metal-free and sustainable catalyst for both transformations. The multicomponent reaction proceeded under