Abstract
In this work, a hydroxyl functionalized Lewis acidic ionic liquid on silica is found to be an efficient heterogeneous catalyst for the C-3 Friedel-Crafts benzylation of indoles with different benzyl alcohols as benzylation agents under mild conditions. This catalytic system benefits from simple operation, work-up and reutilization procedures, wide substrate tolerance, low cost, high catalytic activity and excellent chemo-selectivity. The hybrid combination of hydroxyl functionalized ionic liquid and silica through the formation of hydrogen bond endows this catalyst with high stability in the Friedel-Crafts reaction system, and the catalyst could be easily recycled and reutilized.
Graphical Abstract
A hydroxyl functionalized Lewis acid ionic liquid supported on silica was found to be an efficient catalyst for the C-3 Friedel-Crafts benzylation reaction of iodole with alcohols. This catalyst benefits from low cost, feasible preparation and reutilization, high catalytic activity and selectivity, and the operation and work-up procedures are very simple.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21373079) and Program for Science & Technology Innovation Talents in Universities of Henan Province (14HASTIT015).
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Zhu, A., Feng, W., Li, L. et al. Hydroxyl Functionalized Lewis Acidic Ionic Liquid on Silica: An Efficient Catalyst for the C-3 Friedel-Crafts Benzylation of Indoles with Benzyl Alcohols. Catal Lett 147, 261–268 (2017). https://doi.org/10.1007/s10562-016-1918-z
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DOI: https://doi.org/10.1007/s10562-016-1918-z