Yanqing Peng

IMIDATION OF CYCLIC CARBOXYLIC ANHYDRIDES UNDER MICROWAVE IRRADIATION

Efficient and facile conversion of cyclic carboxylic anhydrides to corresponding imides with formamide under microwave irradiation is described.

Microwave-assisted preparation of functionalized resins for combinatorial synthesis

Abstract A series of functionalized resins were synthesized from Merrifield resin by virtue of microwave irradiation. A significant reduction in reaction time was achieved. This method provides a rapid transformation of functionalized resin in solid-phase synthesis.

Urotropine: an efficient catalyst precursor for the microwave-assisted Knoevenagel reaction

By using urotropine as a catalyst precursor, a rapid microwave-assisted Knoevenagel reaction of various active methylene compounds with aldehydes gave the corresponding olefinic products with satisfactory yields.

Magnetically recoverable nano-sized mesoporous solid acid: effective catalysts for the synthesis of 1-amidoalkyl-2-naphthols

Magnetic mesoporous solid acid, SO3H-MCM-41@NiFe2O4, was prepared and characterized by transmission electron microscopy, X-ray diffraction, N2 adsorption–desorption, and hysteresis loop. Under optimized reaction conditions, three-component condensation of aromatic aldehydes with 2-naphthol and benzamides gave corresponding 1-amidoalkyl-2-naphthols in satisfactory to excellent yields. Catalyst could be recovered by magnetic separation and reused for new runs without significant decrease in activity.Graphical Abstract

Powdered diethylaminoethyl cellulose as biomass-derived support for phosphotungstic acid: new solid acidic catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones

Finely powdered diethylaminoethyl cellulose is prepared through a bottom–up synthetic method using NaOH/urea aqueous solution as solvent. Phosphotungstic acid anchored on the powdered diethylaminoethyl cellulose can be used as a biopolymer-supported solid acidic catalyst for the synthesis of 2,3-dihydroquinazolin-4(1H)-ones from isatoic anhydride, amines, and aldehydes. The catalyst could be easily recovered by simple filtration and reused several times with minor decreases in the reaction yields.Graphical abstract

FeCl3-promoted synthesis of 1,3,4-thiadiazoles under combined microwave and ultrasound irradiation in water

An eco-friendly and efficient synthesis of substituted 1,3,4-thiadiazole derivatives has been developed. This aqueous heterogeneous approach proceeds smoothly and quickly under combined microwave and ultrasound irradiation in the presence of FeCl3.Graphical Abstract

MICROWAVE-ASSISTED ACETALIZATION OF PENTAERYTHRITOL CATALYZED BY 12-TUNGSTOPHOSPHORIC ACID

Efficient conversion of carbonyl compounds and pentaerythritol to corresponding diacetals in the presence of 12-tungstophosphoric acid under microwave irradiation is described.

Application of Ultrasound Irradiation for the Reactions of N-Hydroxymethylation

Abstract A convenient and high yield method for the N-hydroxymethylation of substituted phthalimide and benzimidazole under ultrasound irradiation is reported.

Aqueous heterogeneous synthesis of polysubstituted 2,6-dicyanoanilines via combined microwave and ultrasound-assisted multicomponent reaction

Abstract A series of polysubstituted 3-aryl-2,6-dicyanoaniline derivatives were synthesized by one-pot multicomponent heterogeneous domino reaction of aromatic aldehyde, malononitrile and cyclic ketone under combined microwave and ultrasound irradiation in water. This facile approach reduces the reaction time and energy consumption and increases the yield and selectivity of the product.

Solid phase synthesis of aminochalcones

A microwave-assisted solid phase synthesis of aminochalcones via the Claisen–Schmidt condensation reaction between resin-bound p-aminoacetophenone and aromatic aldehydes was described.