Ag nanoparticles in hollow magnetic mesoporous spheres: A highly efficient and magnetically separable catalyst for synthesis of β-enaminones

Nanosilver as a new generation of silver catalysts in organic transformations for efficient synthesis of fine chemicals

“…Except above reactions that supported the distinctive catalytic activity of silver nanoparticles, nanosilver catalyst systems have also been found some application in other simple reactions, such as the amination of -dicarbonyl compounds to the synthesis of enanmino ketones or esters, 100 Natural chitosan-supported silver nanoparticles has been determined in 2009 as an efficient catalyst in selective carbon-carbon coupling reaction of phenolic compounds in the presence of molecular iodine. 102 It is a very interesting report on the homo-coupling of phenols with silver nanoparticles as catalyst.…”

Design of a graphene oxide-SnO2 nanocomposite with superior catalytic efficiency for the synthesis of β-enaminones and β-enaminoesters

“…In particular, the enaminones and enaminoester moieties have attracted much interest, because they are fundamental and versatile starting materials for the synthesis of heterocycles, 3 alkaloids, 4,5 g-amino alcohol, 6 quinolines, 7 azocompounds 8 and a,b-amino acids. [28][29][30] The basic drawbacks which the previous reaction strategies undergo include requirements for particular reaction environment, 25 hygroscopic triate precursors, 25,27 use of homogeneous catalyst, [31][32][33] formation of side products, requirement of extended reaction time, 34,35 non-reusability of the catalyst, 33 use of expensive reagents, 36,37 and use of toxic reagents and solvents. 16 The scientic community thus seeks for economic synthesis of such ne chemicals.…”

Fabrication of Ag/γ-Fe2O3@TiO2hollow magnetic core–shell nanospheres as highly efficient catalysts for the synthesis of β-enaminones

“…functionalized pyridin-2(1H)-ones which have been used as versatile intermediates in the synthesis of a wide range of nitrogen-containing heterocycles, such as pyridine, piperidine, quinolizidine, and indolizidine alkaloids 3 and biologically active compound 4 such as therapeutic agents 5 which were employed as synthons of different important antibacterial, 6 anti-inflammatory, 6 antitumor agent 7 , dopamine auto-receptor agonists, acetylcholinestersase inhibitors, oxytocin antagonists and anticonvulsants. A few modified procedures have been reported using various catalysts such as Sc(OTf) 3 6 Although the most of reported homogenous catalysts are active for this reaction, they always have some drawbacks such as high cost, and long reaction time. Due to their extensive application, it is very important to search for a convenient and efficient method for the synthesis of this type of compounds.…”