Journal
SYNTHETIC COMMUNICATIONS
Volume 38, Issue 20, Pages 3508-3513Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/00397910802162967
Keywords
bronsted acidic ionic liquid; coumarin-3-carboxylic acids; Knoevenagel condensation; Meldrum's acid; recyclability
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Funding
- Council of Scientific and Industrial Research (CSIR, New Delhi)
- Defence Research and Development Organisation (DRDO, New Delhi)
- CSIR
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A simple, efficient, and green protocol for synthesis of coumarin-3-carboxylic acids is described via Knoevenagel condensation of Meldrum's acid with ortho-hydroxyaryl aldehydes in [Hmim]Tfa ionic liquid, which was found to give better results than other ionic liquids. Furthermore, ionic liquid is easily reused without any appreciable loss in activity.
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