A novel enamination of β-dicarbonyl compounds catalyzed by Bi(TFA)<sub>3</sub> immobilized on molten TBAB
作者:Mohammad M Khodaei、Ahmad R Khosropour、Mehdi Kookhazadeh
DOI:10.1139/v05-021
日期:2005.3.1
Enamination of a wide variety of primary amines was successfully carried out in the presence of catalytic amounts of bismuth(III) trifluoroacetate immobilized on molten tetrabutylammonium bromide as "green" media under mild conditions. This new system of the catalyst is recyclable and reusable. Generally, the results of the reaction in tetrabutylammonium bromide is better than the previously obtained
NMR of Enaminones Part 3—1H,13C and17O NMR Spectroscopic Studies of Acyclic and CyclicN-Aryl Enaminones: Substituent Effects and Intramolecular Hydrogen Bonding
17O, 13C and 1H NMR spectra for para‐ and meta‐substituted 4‐arylaminopent‐3‐en‐2‐ones (acyclic enaminones, 1 and 2) and 3‐arylaminocyclohex‐2‐en‐1‐ones (cyclic enaminones, 3 and 4) are reported. The 17O, 13C and 1H shift values of these enaminones correlate well with σm0 and σp‐ constants in the correlations for meta and para derivatives, and with pKa values of the corresponding anilines. Dual substituent
A general and efficient method for synthesis of enaminones and enamino esters catalyzed by NbCl5 under solvent-free conditions
作者:Yu-Heng Liu、Ping Wang、Gui-Tian Cheng
DOI:10.1007/s00706-012-0783-8
日期:2013.2
synthesis of β-enaminones and β-enamino esters by reacting 1,3-dicarbonyl compounds with amines in the presence of catalytic amounts of niobium pentachloride. The reaction proceeds smoothly at room temperature under solvent-free conditions and leads to chemo- and regioselective formation of enamine derivatives in high to excellent yields. Graphical Abstract
A mild method for the synthesis of β-enaminones and β-enamino esters using KH<sub>2</sub>PO<sub>4</sub> as catalyst
作者:Feng Xu、Hong-Xia Lv、Jin-Ping Wang、You-Ping Tian、Jian-Jun Wang
DOI:10.3184/030823408x382117
日期:2008.12
β-Enaminones and β-enamino esters have been produced by the direct condensation of amines with β-diketones and β-ketoesters using KH2PO4 as catalyst under mild, solvent-free conditions.
K<sub>7</sub>[PW<sub>11</sub>CoO<sub>40</sub>]: Efficient and Ecofriendly Catalyst for the Enamination of β-Dicarbonyl Compounds
作者:Hossein A. Oskooie、Majid M. Heravi、Negar M. Javadi、Khadijeh Bakhtiari、Fatemeh F. Bamoharram
DOI:10.1080/00397910701860968
日期:2008.8.18
Abstract Condensation of a variety of β-dicarbonylcompounds with primary and secondary amines carried out in the presence of catalytic amounts of K7[PW11CoO40]. From this reaction N-substituted β-enamino esters and ketones were obtained in high yields.