A convenient synthesis of coumarins using reusable ionic liquid as catalyst

Abstract

An efficient and convenient method has been developed for the synthesis of substituted coumarin derivatives using a Brønsted acidic ionic liquid as catalyst under solvent-free conditions. The catalyst can be reused for six consecutive runs without significant loss of activity.

Keywords:

• functionalized ionic liquid
• 4-substituted coumarin
• Pechmann condensation
• recycling

Acknowledgements

Alakananda Hajra is pleased to acknowledge the financial support from DST (Grant No. SR/FTP/CS-107/2006) and Adinath Majee is pleased to acknowledge the financial support from CSIR (Grant No. No. 012251/08/EMR-II).