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Abstract
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.
ACKNOWLEDGMENTS
The authors are thankful to the Council of Scientific and Industrial Research (CSIR, New Delhi) and the Defence Research and Development Organisation (DRDO, New Delhi) for the financial support. N. B. D., S. V. B., and D. J. R. are thankful to CSIR for the award of senior research fellowships.