Abstract
A highly efficient synthesis of 4H-pyrano[2,3-c]pyrazoles has been completed using four-component cyclocondensation of hydrazine monohydrate/phenyl hydrazine, ethyl acetoacetate, aldehydes, and malononitrile in the presence of L-proline and room-temperature ionic liquids.
ACKNOWLEDGMENTS
Financial assistance by the Council of Scientific and Industrial Research, New Delhi, India, as a junior research fellowship to Bhaskara Nand and junior and senior research fellowships to Sanjay Kumar is gratefully acknowledged.