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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

✍ Scribed by Weiwei Ma; Xiao Wang; Fulin Yan; Liqiang Wu; Yingling Wang


Book ID
106214588
Publisher
Springer Vienna
Year
2010
Tongue
English
Weight
226 KB
Volume
142
Category
Article
ISSN
0026-9247

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Zr(HSO4)4-catalyzed one-pot three-compon
✍ Xiao Wang; Guangzhou Lu; Fulin Yan; Weiwei Ma; Liqiang Wu 📂 Article 📅 2011 🏛 Journal of Heterocyclic Chemistry 🌐 English ⚖ 83 KB

## Abstract A new, one‐pot, simple thermally efficient and solvent‐free method for the preparation of 7‐alkyl‐6__H__,7__H__‐naphtho[1′,2′:5,6]pyrano[3,2‐__c__]chromen‐6‐ones by condensation of β‐naphthol, aromatic aldehydes, and 4‐hydroxycoumarin using Zr(HSO~4~)~4~ as a safe and efficient catalyst