Abstract
In a unique approach, four-component synthesis of some pyrano[2,3-c]pyrazoles by [ChCl][ZnCl2]2 and [H-NMP]HSO4 as inexpensive and recyclable acidic ionic liquids were investigated. Excellent yields of products were obtained using both environmentally friendly safe ionic liquids. A comparative study of [ChCl][ZnCl2]2 as Lewis acidic ionic liquid and [H-NMP]HSO4 as Bronsted acidic ionic liquid was also carried out. The results showed that advantages of these ionic liquids were their low reaction time, lack of by-products and their reusability in comparison with reported basic ionic liquid.
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