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Novel Brønsted Acidic Ionic Liquids Based on Benzimidazolium Cation: Synthesis and Catalyzed Conjugate Addition of Indoles with α,β-unsaturated Ketones

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Abstract:

Brønsted acidic ionic liquids based on benzimidazolium cation was synthesized and employed as an efficient catalysts for the Michael addition reaction of indoles to α,β-unsaturated ketones under mild conditions to afford the corresponding conjugate addition products in high yields (90%-98%). The catalyst 1-butyl-3-(3-sulfopropyl)benzimidazolium p-toluenesulfonate ([PSbbim][p-CH3PhSO3]) could be reused at least three times without a noticeably decrease in its activity.

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Periodical:

Advanced Materials Research (Volumes 233-235)

Pages:

977-984

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.233-235.977

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Online since:

May 2011

Authors:

Bin Wang, Chen Jiang Liu

Keywords:

Brønsted Acidic Ionic Liquids, Conjugate Addition, Indoles, Α,β-Unsaturated Ketones

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© 2011 Trans Tech Publications Ltd. All Rights Reserved

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