Letters in Organic Chemistry

Gwilherm Evano
Free University of Brussels
Brussels
Belgium

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Synthesis of 3-substituted Coumarins: An Efficient Green Approach Using L-proline as Catalyst in Triethanolamine Medium

Author(s): Devulapally Srikrishna, Syed Tasqeeruddin, Pramod Kumar Dubey.

Graphical Abstract:


Abstract:

3-Substituted coumarins were synthesized very efficiently, using Knoevenagel method from salicylaldehydes 1 and active methylene compounds 2 under green conditions. The effect of catalyst and solvent on this condensation was studied. L-proline was found to be the best catalyst and triethanolamine the best reaction medium for this reaction.

Keywords: Salicylaldehydes, active methylene compounds, L-proline, triethanolamine, coumarins, Knoevenagel condensation.

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Article Details

VOLUME: 11
ISSUE: 8
Year: 2014
Page: [556 - 563]
Pages: 8
DOI: 10.2174/1570178611666140512215136
Price: $58