Bimetallic Ag–Cu alloy nanoparticles as a highly active catalyst for the enamination of 1,3-dicarbonyl compounds
作者:Lipeeka Rout、Aniket Kumar、Rajendra S. Dhaka、Priyabrat Dash
DOI:10.1039/c6ra04569c
日期:——
Bimetallicnanoparticles, particularly those based on copper, have recently attracted a great deal of attention for the development of low cost and highlyactive catalysts due to the synergistic interaction between individual metal components. In this work, bimetallic Ag–Cu alloynanoparticles were explored as a highlyactive and reusable catalyst for the enamination of 1,3-dicarbonyls using diverse
Two-Step Stereocontrolled Synthesis of Densely Functionalized Cyclic β-Aminoesters Containing Four Stereocenters, Based on a New Cerium(IV) Ammonium Nitrate Catalyzed Sequential Three-Component Reaction
作者:Vellaisamy Sridharan、J. Carlos Menéndez
DOI:10.1021/ol801738d
日期:2008.10.2
The cerium(IV) ammoniumnitrate (CAN)-catalyzed sequential, one-pot reaction between alkylamines, beta-ketoesters, and chalcones afforded cis-4,6-disubstituted 2-alkylaminocyclohexene-1-carboxylic esters with complete diastereoselectivity. The carbon-carbon double bond of these compounds was reduced with sodium triacetoxyborohydride, again with complete diastereoselectivity. This novel two-step route
A catalyst-free and convenient approach for the preparation of cyclohexa-1,3-dienecarboxylate derivatives is described. This three-componentreaction between primary amines, alkyl acetoacetate, and dibenzylideneacetone proceeds under solvent-free condition in good to excellent yields. primary amines - alkyl acetoacetate - dibenzylideneacetone - cyclohexa-1,3-dienecarboxylate - solvent-free
Enamination of a wide various primary amines was successfully carried out in the presence of catalytic amounts of cerium chloride heptahydrate in ionic liquid and solvent-free conditions as 'green' media under mild reaction conditions.
variety of polysubstituted trans-2,3-dihydropyrroles from a wide range of chalcones and β-enamine ketones (esters) via iodine-promoted tandem Michael/cyclization sequence has been developed, affording the desired products in moderate to excellent yields. This methodology is a highly efficient, convenient way to access functionalized 2,3-dihydropyrroles from readily accessible substrates under mild reaction