Chemical Papers

, Volume 69, Issue 4, pp 586–595 | Cite as

Synthesis of pyranopyrazoles, benzopyrans, amino-2-chromenes and dihydropyrano[c]chromenes using ionic liquid with dual Brønsted acidic and Lewis basic sites

  • Davood Habibi
  • Atefeh Shamsian
  • Davood Nematollahi
Original Paper


An efficient ionic liquid with both Brønsted acidic and Lewis basic sites, namely 1,4-dimethyl-1-(4-sulphobutyl)piperazinium hydrogen sulphate (IL1), was synthesised and characterised. IL1 is a “green”, homogeneous and reusable catalyst for: i) the synthesis of pyranopyrazoles (Va-Vj)and benzopyrans (VIa-VIj and VIIa-VIIf) at ambient temperature under solvent-free conditions and ii) the synthesis of amino-2-chromenes (VIIIa-VIIIi and IXa-IXi) and dihyropyrano[c]chromenes (Xa-Xi) at 80 °C under solvent-free conditions. The reactions were rapid with excellent product yields. In addition, the double Brønsted acid, 1,4-dimethyl-1,4-bis(4-sulphobutyl)piperazinium hydrogen sulphate (IL2), was prepared to evaluate the cooperation efficiency of their Brønsted acidic and Lewis basic sites as compared with the double Brønsted acidic sites in IL1.


ionic liquid synthesis pyranopyrazoles benzopyrans amino-2-chromenes dihydropyrano[c]chromenes 


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Copyright information

© Institute of Chemistry, Slovak Academy of Sciences 2014

Authors and Affiliations

  • Davood Habibi
    • 1
  • Atefeh Shamsian
    • 1
  • Davood Nematollahi
    • 1
  1. 1.Department of Organic Chemistry, Faculty of ChemistryBu-Ali Sina UniversityHamedanIran

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