Abstract
An efficient synthesis of 7-alkyl-6H,7H-naphtho[1′,2′:5,6]pyrano[3,2-c]chromen-6-ones by three-component condensation reaction of β-naphthol, aromatic aldehydes, and 4-hydroxycoumarin under solvent-free conditions in good to excellent yields and short reaction times using reusable melamine trisulfonic acid as solid acid catalyst has been investigated.
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We are pleased to acknowledge the financial support by Henan Research Program of Foundation and Advanced Technology (no. 102300410101).
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Ma, W., Wang, X., Yan, F. et al. Reusable melamine trisulfonic acid-catalyzed three-component synthesis of 7-alkyl-6H,7H-naphtho[1′,2′:5,6]pyrano[3,2-c]chromen-6-ones. Monatsh Chem 142, 163–167 (2011). https://doi.org/10.1007/s00706-010-0427-9
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DOI: https://doi.org/10.1007/s00706-010-0427-9