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.
Graphene oxide: A carbocatalyst for the one-pot multicomponent synthesis of highly functionalized tetrahydropyridines
作者:Annah Gupta、Ramneet Kaur、Deepika Singh、Kamal K. Kapoor
DOI:10.1016/j.tetlet.2017.05.067
日期:2017.6
and efficient methodology is described for the synthesis of polysubstituted tetrahydropyridine via one-potmulticomponentreaction of β-ketoester, aldehyde and aniline in presence of catalytic amount of graphene oxide in acetonitrile. Graphene oxide is a versatile carbocatalyst and this is the first report on its application in a five component reaction. Good yield, usage of readily available starting
Three naphthalenedisulfonate polymers with imidazole-containing ligands: Synthesis, structure and heterogeneously catalytic performance in reactions of enamination of β -dicarbonyl compounds
Three new naphthalenedisulfonate polymers, [Cd(2,6-nds)(bib)](n) (1), [Cd(1,5-nds)(bib)](n) (2), and [Cu(2,6nds)(0.5)(tpim)](n) (3), have been successfully synthesized by hydrothermal reactions of corresponding metal salts with naphthalenedisulfonate (nds) and imidazole-containing ligands 1,4-bis(imidazol-1-ylmethyl) benzene (bib) and 2,4,5-tri(4-pyridyl)-imidazole (tpim). The structures of these polymers were determined by single crystal X-ray diffraction analysis. Polymers 1 and 2 crystallize in the same space group and have similar cell parameters, and thus show same three-dimensional (3D) framework architecture. Complex 3 has the same 2D layer structure. The photoluminescent properties of the complexes 1 and 2 were investigated. Catalytic tests indicate that complex 3 has chemo-and regio-selective catalytic activity towards enamination of beta-ketoesters. (C) 2015 Elsevier B.V. All rights reserved.