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Vol. 30 No. 5 (2018): Vol 30 Issue 5, 2018

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Synthesis of Novel Acidic Ionic Liquid [BBSA-DBU][HSO4] and Its Catalytic Activities for Synthesis of Pyrazolopyranopyrimidine Derivatives

https://doi.org/10.14233/ajchem.2018.21028
M. Patil
Synthetic Research Laboratory, P.G. Department of Chemistry, P.D.V.P. College, Tasgaon-416 312, India
S. Shinde
Synthetic Research Laboratory, P.G. Department of Chemistry, P.D.V.P. College, Tasgaon-416 312, India
S. Damate
Synthetic Research Laboratory, P.G. Department of Chemistry, P.D.V.P. College, Tasgaon-416 312, India
S. Patil
Synthetic Research Laboratory, P.G. Department of Chemistry, P.D.V.P. College, Tasgaon-416 312, India

Corresponding Author(s) : S. Patil

sanyujapatil@yahoo.com

Asian Journal of Chemistry, Vol. 30 No. 5 (2018): Vol 30 Issue 5, 2018

Abstract

A novel Brønsted acid ionic liquid 1,8-bis(butanesulphonic acid)diazobicyclo[5.4.0]undec-7-enium hydrogen sulphate [BBSA-DBU][HSO4] has been synthesized from 1,8-diazabicyclo(5.4.0)undec-7-ene (DBU). The synthesised ionic liquid was characterized by 1H and 13C NMR spectroscopic techniques. The room-temperature derived ionic liquid is highly acidic due to presence of two -SO3H groups and two -HSO4– anions. The ionic liquid [BBSA-DBU][HSO4]showed high catalytic activity (5 mol %) for the synthesis pyrazolpyrano-pyrimidine derivatives with good to excellent yields in short reaction time at 60 °C under solvent-free conditions. Moreover, ionic liquid could be easily recovered and reused at least five times without change in its catalytic activity.

Keywords

Brønsted acid SO3-H Bifunctionalized ionic liquid Pyrazolopyranopyrimidine Reusable catalyst
Patil, M., Shinde, S., Damate, S., & Patil, S. (2018). Synthesis of Novel Acidic Ionic Liquid [BBSA-DBU][HSO4] and Its Catalytic Activities for Synthesis of Pyrazolopyranopyrimidine Derivatives. Asian Journal of Chemistry, 30(5), 961–966. https://doi.org/10.14233/ajchem.2018.21028
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