Research on Chemical Intermediates

, Volume 44, Issue 9, pp 5483–5500 | Cite as

[Bu3NH][HSO4] catalyzed: an eco-efficient synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones and 2H-indazolo[2,1-b]phthalazine-triones under solvent-free conditions

  • Mohd Akmal Shaikh
  • Mazahar Farooqui
  • Syed Abed


A Brønsted acidic ionic liquid [Bu3NH][HSO4] as an eco-efficient catalyst for the one-pot multicomponent synthesis of 1H-pyrazolo[1,2-b]phthalazine-5,10-diones and 2H-indazolo[2,1-b]phthalazine-triones by using various aldehyde, malononitrile/dimedone, and phthalhydrazide in the absence of a solvent at 80 °C is described. Further, the catalyst is prepared from readily available reagents and fully characterized by different techniques such as FT-IR, 1H-NMR, 13C-NMR, and TG, DTG and DTA analyses. The current synthetic protocol offers the mild reaction conditions, short reaction times (9–30 min), excellent yields of the products (83–95%), a clean and straightforward work-up, reusability of the catalyst up to seven catalytic runs, and a sustainable alternative to the existing methods.


Brønsted acidic ionic liquids [Bu3NH][HSO41H-pyrazolo[1,2-b]phthalazine-5,10-diones 2H-indazolo[2,1-b]phthalazine-triones Sustainable techniques 



The authors are grateful to the principal of Maualna Azad College, Aurangabad for providing the laboratory facilities. We are also grateful to SAIF Panjab University, Chandigarh and STIC Cochin University of Science & Technology, Cochin, for spectral analysis.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.


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Copyright information

© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Post Graduate and Research CentreMaulana Azad CollegeAurangabadIndia
  2. 2.Dr. Rafiq Zakaria College for WomenAurangabadIndia
  3. 3.Government College of Arts and ScienceAurangabadIndia

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