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


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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.

Sobre autores

E. Goud

Department of Chemistry

Email: erukalayadaiahgoud@gmail.com
Índia, Hyderabad, Telangana, 500007

Y. Rao

Department of Chemistry; Department of Chemistry

Autor responsável pela correspondência
Email: erukalayadaiahgoud@gmail.com
Índia, Hyderabad, Telangana, 500007; Nizamabad, 503322

Y. Hemasri

Department of Chemistry, Nizam College

Email: erukalayadaiahgoud@gmail.com
Índia, Hyderabad, 500001

G. Thirupathi

Department of Chemistry

Email: erukalayadaiahgoud@gmail.com
Índia, Hyderabad, Telangana, 500007

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