Paper
RSC Advances
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Conclusion
In conclusion, the MMT supported catalyst Cu-Q-MMT was
prepared by using cation-exchanged and impregnation–reduc-
tion methods. The obtained catalyst showed high activity for
cascade sequence to indole-2-carboxylic esters. Remarkably,
this catalyst could catalyze ethyl acetamidoacetate with inactive
chlorobenzaldehydes and gave a good yield. In addition, the
catalyst could be easily isolated from the reaction mixture by
centrifugation and reused up to 6 times. The high activity and
stability of Cu-Q-MMT catalyst is mainly ascribed to the excel-
lent synergistic effects of biquaternary ammonium salts, Cu
nanoparticles and the nano space structure of MMT. We believe
that other transition metals could also be supported on MMT
using this method and the resulting materials could be used as
efficient and stable nanocatalyst.
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Acknowledgements
The authors are grateful for nancial support from the National
Natural Science Foundation of China (21303139).
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