Journal
RSC ADVANCES
Volume 7, Issue 23, Pages 13754-13759Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c6ra25861a
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Funding
- National Natural Science Foundation of China [21303139]
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Copper nanoparticles immobilized onmontmorillonite (MMT) by biquaternary ammoniumsalts (N-1, N-6-dibenzyl-N-1, N-1,N-6,N-6-tetramethylheptane-1,6-diaminium bromide, Q) were prepared by cation-exchange and impregnation-reduction and designated Cu-Q-MMT. The material was extensively characterized by various characterization techniques such as FTIR, XRD, XPS, SEM, TEM, and N-2 adsorption-desorption. The Cu-Q-MMT could be used as a highly active heterogeneous catalyst for cascade sequence to indole-2-carboxylic esters from ortho-bromobenzaldehydes with ethyl acetamidoacetate. Even for inactive chlorobenzaldehydes, a good yield could be obtained. In addition, the catalyst can be reused six times without any significant loss of activity. The high activity and stability of the Cu-Q-MMT catalyst is mainly attributed to the excellent synergistic effects of biquaternary ammonium salts, Cu nanoparticles and the nanospace structure of MMT.
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