KCC-1 Supported Ruthenium-Salen-Bridged Ionic Networks as a Reusable Catalyst for the Cycloaddition of Propargylic Amines and CO2

Improving the size uniformity of dendritic fibrous nano-silica by a facile one-pot rotating hydrothermal approach

“…Dendritic brous nano-silica (DFNS), [1][2][3][4][5][6] also originally denoted and well-known as KCC-1, [7][8][9][10][11][12][13][14][15][16][17][18][19] possesses unique structural characteristics of three-dimensional (3D) center-radial nanochannels and hierarchical nanopores which give rise to highly accessible internal spaces, open pore channels, large pore volumes, etc. Diverse guest species, such as functional molecules or nano-particles (NPs), could be easily transported through the radial porous architectures to achieve their efficient loading or react with the chemically active sites on these nanochannels.…”

Solvent-free incorporation of CO2 into 2-oxazolidinones: a review

“…In 2016, the group of Yuan-Yao reported the rst protocol for metal-catalyzed three-component cycloaddition of epoxides, amines, and CO 2 under solvent-free condition. 50 In this investigation, various rare-Earth-metal complexes stabilized by amine-bridged tri-(phenolato) ligands (42)(43)(44)(45)(46)(47), co-catalysts (e.g., NBu 4 I, NBu 4 Br, NOCt 4 Br, PPNCl), and additives (e.g., DBU, Et 3 N, TMEDA, DABCO) were examined and the combination of 46/NBu 4 Br/DBU as catalytic system at 95 C was found to be optimal for this transformation. The optimized protocol tolerated a variety of terminal epoxides 48 and both electron-rich and electron-poor anilines 49 and provided the expected 5substituted-3-aryl-2-oxazolidines 50 in moderate to excellent yields (Scheme 22).…”

“…In a related investigation, the same research team applied KCC-1 nanoparticle-supported Salen/Ru catalyst (KCC-1/Salen/ Ru(II) NPs) for the cycloaddition of the same set of N-propargylamines 29 with CO 2 (1 MPa) under solvent-free conditions at 100 C. 43 The reaction was completed within 1 h and the target 2-oxazolidinones 30 were obtained with yield range from 92% to 98%.…”

Synthesis of pyrazolopyrimidines in mild conditions by gold nanoparticles supported on magnetic ionic gelation in aqueous solution

“…FeNi 3 core‐shell NPs have been used as suitable catalysts in many reactions, including the synthesis of 1,3‐thiazolidin‐4‐ones, [ 49 ] triazolo[1,2‐ a ]indazole‐triones, [ 50 ] and 4H‐benzo[b]pyrans. [ 51 ] Given our continued interest in nanocatalysis and catalyst development for organic reactions, [ 52–61 ] in this work we developed a facile synthesis of gold NPs supported on a magnetically separable IG‐based nanomaterial, FeNi 3 /IG/Au, at room temperature via a wet impregnation technique based on IG using TPP as the cross‐linking agent and FeNi 3 as the magnetic core to allow for magnetic separation. In addition, we describe its use in the synthesis of pyrazolopyrimidines, which could be easily separated from the reaction mixture for reuse (Scheme 1).…”