Fe doped barium aluminate nano-powder: A versatile catalyst for the epoxidation of α, β-unsaturated ketone derivatives

Fe doped BaAl2O4 nano powder has been prepared via homogeneous precipitation method and was characterized by XRD, FE-SEM and EDAX analysis. The XRD patterns show hexagonal phase of BaAl2O4. The particles have an irregular shape with an average size of 32 nm as determined by FE-SEM. The as-prepared nano-powder was used as an efficient catalyst for the epoxidation of α,β-unsaturated ketones in aqueous ethanol (70%). The effects of solvent and catalyst concentration on the epoxidation recation were investigated

Majid Ghashang.pmd

ABSTRACT Silica supported zinc (II) chloride (SiO 2 -ZnCl 2 ) as an efficient and non-toxic heterogeneous catalyst have been used for the simple and facile synthesis of 2,3-dihydroquinazolin-4(1H)-ones through the direct cyclo-condensation of anthranilamide and aldehydes or one-pot three-component cyclo-condensation of isatoic anhydride, ammonium acetate (or amines) and aldehydes under solvent-free conditions

Fe doped barium aluminate nano-powder: A versatile catalyst for the epoxidation of α, β-unsaturated ketone derivatives

178-183Fe doped BaAl2O4 nano powder has been prepared via homogeneous precipitation method and was characterized by XRD, FE-SEM and EDAX analysis. The XRD patterns show hexagonal phase of BaAl2O4. The particles have an irregular shape with an average size of 32 nm as determined by FE-SEM. The as-prepared nano-powder was used as an efficient catalyst for the epoxidation of α,β-unsaturated ketones in aqueous ethanol (70%). The effects of solvent and catalyst concentration on the epoxidation recation were investigated

Preparation of skeletally diverse quinazoline-2,4(1H,3H)-diones using Na2SiO3/SnFe2O4 catalytic system through a four-component reaction

Sodium silicate with the formula of Na2SiO3 was used for the four-component reaction of ketones, aldehydes and cyanoacetamide. The effect of SnFe2O4 nano-particles on the catalytic potential of Na2SiO3 was investigated. The desired products synthesized by this method are 5-amino-7-aryl-2,4-dioxo-2,3,4,4a,7,7a,8,9,10,11-decahydro-1H-benzo[i]quinazoline-6-carbonitriles, 5-amino-2,4-dioxo-7-aryl-1,2,3,4,4a,7,7a,8,10,11-decahydropyrano[3,4-i] quinazoline-6-carbonitrile, 5-amino-9-methyl-2,4-dioxo-7-aryl-2,3,4,4a,7,7a,8,9,10,11-decahydro-1H-pyrido[3,4-i] quinazoline-6-carbonitrile and 5-amino-2,4-dioxo-7-aryl-1,2,3,4,4a,7,7a,8,10,11-decahydrothiopyrano[3,4-i]quinazo-line-6-carbonitrile derivatives. This method has advantages of high yields, simple procedure and easy work-up

Pentafluorophenylammonium triflate (PFPAT) catalyzed facile construction of substituted chromeno[2,3-d]pyrimidinone derivatives and their antimicrobial activity

A new, simple thermally efficient and solvent-free condensation of 2-amino-3-cyano-6-methyl-4-phenyl-4H-pyran-5-ethylcarboxylate derivatives with coumarin-3-carboxylic acid employing pentafluorophenylammonium triflate (PFPAT) as an inexpensive organocatalyst for the synthesis of a series of ethyl 4,5-dihydro 7-methyl-2-(2-oxo-2H-chromen-3-yl)-4-oxo-5-aryl-3H-chromeno[2,3-d]pyrimidine-6-carboxylate derivatives is described. This method has the advantages of high yields, a cleaner reaction, simple methodology, short reaction times, easy workup, and greener conditions. All the compounds were evaluated for their in vitro antimicrobial activity against different bacterial and fungal strains

Symmetrical ammonium dibromide as an efficient promoter for the ultrasonic irradiation multi-component preparation of pyrrolidine derivatives

In this work, a method has been developed for the formal, multi-component reaction of cyclopropyl dicarboxylates, aldehydes, and amines under ultrasonic irradiation. The symmetrical dibromide salt (A) was prepared from the reaction of 1,2-bis(2-bromoethoxy)ethane with 2,3,4,6,7,8-hexahydropyrrolo[1,2-a]pyrimidine in toluene under reflux condition. CeCl3 and compound (A) were used as catalyst and promoter and showed a good potential for application in the synthesis of a range of structurally diverse pyrrolidine rings in short reaction times (3–5 h) and excellent yields (89–97 %)

Phthalimide-N-sulfonic acid as a recyclable organocatalyst for an efficient and eco-friendly synthesis of 2-(2-oxo-2H-chromen-3-yl)-4-aryl-indeno[1,2-b]pyridine-5-one derivatives

A facile and environmentally benign synthesis of some 2-(2-oxo-2H-chromen-3-yl)-4-aryl-indeno[1,2-b]pyridine-5-one derivatives from the reaction of aromatic aldehydes, 3-acetylcoumarin, 1,3-indandione and ammonium acetate using phthalimide-N-sulfonic acid (PISA) as a catalyst is described. The present method has some important features such as mild reaction conditions, short reaction times, less catalyst dosage and high yields with the green aspects by avoiding toxic catalysts and solvents. Further, the catalyst can be reused for four times without any noticeable decrease in the catalytic activity