A new strategy for synthesis of 9-benzoyl-4-methylpyrano[2,3- f ]chromene-2,8-dione using L-proline as a novel and efficient catalyst

E. Y. Goud; Y. J. Rao; Y. Hemasri; G. Thirupathi

doi:10.1134/S1070363216120331

A new strategy for synthesis of 9-benzoyl-4-methylpyrano[2,3-f]chromene-2,8-dione using L-proline as a novel and efficient catalyst

Authors: Goud E.Y.¹, Rao Y.J.¹, Hemasri Y.², Thirupathi G.¹
Affiliations:
1. Department of Chemistry
2. Department of Chemistry, Nizam College
Issue: Vol 86, No 12 (2016)
Pages: 2732-2736
Section: Article
URL: https://journals.rcsi.science/1070-3632/article/view/216849
DOI: https://doi.org/10.1134/S1070363216120331
ID: 216849

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Abstract

We report the high yield synthesis of novel 9-benzoyl-4-methylpyrano[2,3-f]chromene-2,8-dione derivatives obtained by the reaction of 8-formyl-7-hydroxy-4-methylcoumarin with various active methylene compounds. A mechanism of the tandem Knoevenagel condensation and cyclisation reaction is proposed. Structures of all compounds were elucidated on the basis of ¹H and ¹³C NMR, and mass spectrometry, and elemental analysis.