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
demonstrates condensation-promoting effects. To gain insight into the reaction, in situ React IR technology was used to confirm the reactivity. Different amines were condensed in high yields with β-diketones or β-ketoesters in the presence of TCCA to afford the corresponding products in a short time (10~20 min), which displayed some advantages and provided an alternative condensation strategy.
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
A new copper-based metal–organic framework as a promising heterogeneous catalyst for chemo- and regio-selective enamination of β-ketoesters
作者:Ying Zhao、Dong-Sheng Deng、Lu-Fang Ma、Bao-Ming Ji、Li-Ya Wang
DOI:10.1039/c3cc45310c
日期:——
Assembly of 5-nitro-1,2,3-benzenetricarboxylic acid (H3nbta) with CuII in the presence of 1,3-bis(1,2,4-triazol-1-yl)propane (1,3-btp) leads to a new metalâorganic framework, [Cu(Hnbta)(1,3-btp)]·2H2O (A1), which is shown to be an efficient and recyclable heterogeneous catalyst for enamination of β-ketoesters with excellent product yields and selectivity.
AlCl<sub>3</sub>-catalyzed [3 + 3] cycloaddition of chalcones and β-enamine ketones (esters): a highly efficient access to multisubstituted cyclohexa-1,3-dienamines
作者:Meng-Ming Xing、Hui Xu、Li-Fen Hou、Jian-Rong Gao、Yu-Jin Li
DOI:10.1039/c5ra25691g
日期:——
An efficient protocol was successfully achieved to give 1,3-cyclohexadiene derivatives in good to excellent yields from chalcones and β-enamine ketones (esters) promoted by AlCl3.