An efficient and recyclable bifunctional acid–base ionic liquid for synthesis of 1H-indazolo[1,2-b]phthalazinetriones

An efficient and recyclable bifunctional acid–base ionic liquid for synthesis of... A bifunctional ionic liquid, 1,4-dimethyl(4-sulfobutyl)piperazinium hydrogen sulfate ([DMSBP][HSO4], 1), containing both acid and basic sites was prepared. This ionic liquid was used as a homogeneous and reusable catalyst and efficiently promoted synthesis of 1H-indazolo[1,2-b]phthalazinetriones (5a–m) in a one-pot, four-component condensation reaction of phthalic anhydride, hydrazinium hydroxide, dimedone, and aromatic aldehydes under solvent-free conditions at 80 °C. Advantages of the method include short reaction time, high yields, and simple purification. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

An efficient and recyclable bifunctional acid–base ionic liquid for synthesis of 1H-indazolo[1,2-b]phthalazinetriones

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Publisher
Springer Journals
Copyright
Copyright © 2014 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-014-1736-0
Publisher site
See Article on Publisher Site

Abstract

A bifunctional ionic liquid, 1,4-dimethyl(4-sulfobutyl)piperazinium hydrogen sulfate ([DMSBP][HSO4], 1), containing both acid and basic sites was prepared. This ionic liquid was used as a homogeneous and reusable catalyst and efficiently promoted synthesis of 1H-indazolo[1,2-b]phthalazinetriones (5a–m) in a one-pot, four-component condensation reaction of phthalic anhydride, hydrazinium hydroxide, dimedone, and aromatic aldehydes under solvent-free conditions at 80 °C. Advantages of the method include short reaction time, high yields, and simple purification.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jun 19, 2014

References

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