H3PW12O40 catalyzed efficient synthesis of 4-substituted coumarins

BC Raju, TH Balm, JM Rao

Index: Raju, B. China; Babu, T. Hari; Rao, J. Madhusudana Indian Journal of Chemistry - Section B Organic and Medicinal Chemistry, 2009 , vol. 48, # 1 p. 120 - 123

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Citation Number: 7

Abstract

Abstract: Phosphotungstic acid is commercially available and environmentally benign catalyst to promote the Pechmann condensation of various phenols with β-Ketoesters afford 4-substituted coumarins 3a-g in very good yields. This method is practical and provides several advantages.