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Relevant academic research and scientific papers

Reaction between Chalcones, 1,3-Dicarbonyl Compounds, and Elemental Sulfur: A One-Pot Three-Component Synthesis of Substituted Thiophenes

A simple and atom-economic synthesis of highly substituted thiophenes is demonstrated. Heating a solution of a chalcone and a linear/cyclic 1,3-dicarbonyl compound with elemental sulfur in CH 3 CN in the presence of NEt 3 at 80 °C af

Aminopropylated PEG as a novel, eco-friendly and biodegradable basic catalyst for bis-Michael addition to α,β-unsaturated ketones under solvent-free conditions

A solvent-free and highly efficient protocol has been developed for the synthesis of novel bis-Michael addition products (3a, 3b, 3c, 3d, 3e, 3f, 3g, 3h, 3i, 3j, 3k, 3l, 3m, 3n, 3o) using aminopropylated PEG-6000 (NH 2-PEG) as a biodegradable a

Novel and versatile solid superbases derived from magnesium-zirconium composite oxide and their catalytic applications

Versatile solid superbases were derived from magnesium-zirconium composite oxide and KOH through thermal treatment in a N2 flow. The magnesium-zirconium composite oxide was prepared by a modified co-precipitation technique with reflux-digestion in basic solution and then mixed with KOH through grinding. The as-prepared solid superbases were characterized by low-temperature N2 physisorption, powder X-ray diffraction, and Fourier transformation infrared spectrophotometry. The superbasic sites were characterized by the use of Hammett indicators and CO2 temperature-programmed desorption methods. We found that there are ample superbasic sites (0.590 mmol g-1) on the surface with strength in the 26.5 ≤ H- 33.0 range. The as-prepared solid superbase catalyst was found to show excellent catalytic activity towards Knoevenagel condensation, Michael addition and transesterification reactions. The findings open up a new route for the synthesis of new functional superbases using composite oxides prepared by reflux-digestion in basic solution as supports.

Iron-catalyzed Michael reactions revisited: A synthetically useful process for the preparation of tri-carbonyl compounds and chiral warfarin

The LBAs (Lewis acid-assisted Br?nsted acid catalysis) is proposed as possible mechanistic process in the simple FeCl3-catalyzed Michael reactions of chalcones with active methylene compounds in organic solvents. And iron salts were found to be effective promoters in the asymmetric Michael addition of 4-hydroxycoumarin to α,β-unsaturated ketone, which resulted in excellent yield and high level of enantioselectivity (up to 91% ee) in the presence of low catalytic amount of iron and simple chiral primary amine.

Polyaniline-Anchored Metal Salts for Michael Reaction of ,-Unsaturated Ketones

A catalyst consisting of polyaniline-anchored metal salts is used as a Lewis acid to promote the Michael reaction of ,-unsaturated ketones. The reaction is performed efficiently with imidazole, acetyl acetone, and ethyl acetate as Michel donors and chalcones as the acceptors under ultrasound irradiation.

Michael additions of methylene active compounds to chalcone in ionic liquids without any catalyst: The peculiar properties of ionic liquids

Michael additions of malonodinitrile as well as several other reagents to chalcone have been found to proceed well in pure ionic liquids, without the addition of any catalyst. The catalytic effect of the residual acidity caused by hydrolysis of ionic liqu

Layered double hydroxides-supported diisopropylamide: Synthesis, characterization and application in organic reactions

The layered double hydroxides-supported diisopropylamide (LDH-DA) catalyst is found to be an efficient and selective solid base for aldol, Knoevenagel, Henry, Michael, transesterification and epoxidation reactions under liquid phase conditions. LDH-DA is synthesized by the interaction of lithium diisopropylamide with LDH-NO3 (as-synthesized) and calcined LDH-NO3. The LDH-DA (Mg/Al, 3/1) and their precursors are well characterized by using various instrumental techniques such as FT-IR, TGA and DTA, powder XRD, solid state 27Al MAS NMR spectroscopy, SEM and XPS (ESCA).

Magnesium-lanthanum mixed metal oxide: A strong solid base for the michael addition reaction

Michael additions were achieved quantitatively at room temperature with a broad spectrum of acceptors and donors, using a magnesium-lanthanum mixed oxide, a strong solid base. The best solvent for the reaction is dimethylformamide, but good yields were al

High surface area MgO as a highly effective heterogeneous base catalyst for michael addition and knoevenagel condensation reactions

Magnesium oxide (MgO), obtained using a novel but simple procedure, was systematically investigated as a heterogeneous base catalyst for reactions taking place in the liquid phase, specifically the Michael addition and the Knoevenagel condensation. The ac

A rapid one-pot synthesis of 2,4,6-triaryl-3-aroyl-4-hydroxy-1,1-cyclohexanedicarbonitriles and 2-aminoisophthalonitriles under microwave activation

Ylidenemalononitriles 1 react with a variety of 1,3-diaryl-2-propen-1-ones 2 at ambient temperature and pressure under microwave activation to yield functionalised cyclohexanedicarbonitriles 3 and 2-aminoisophthalonitriles 4 in good yields.