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Efficient One-Pot Syntheses of 7-Alkyl-6 H ,7 H -naphtho[1,2:5,6]pyrano-[3,2- c ]chromen-6-ones by 1-Methyl-3-(2-(sulfooxy)ethyl)-1 H -imidazol-3-ium Chloride

✍ Scribed by Wan, Yu; Wang, Chao; Wang, Hai-ying; Zhao, Ling-ling; Zhang, Xiao-xiao; Shi, Jing-jing; Huang, Shu-ying; Liu, Gui-Xiang; Wu, Hui


Book ID
121816951
Publisher
Journal of Heterocyclic Chemistry
Year
2014
Tongue
English
Weight
207 KB
Volume
51
Category
Article
ISSN
0022-152X

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## Abstract A new, one‐pot, simple thermally efficient and solvent‐free method for the preparation of 7‐alkyl‐6__H__,7__H__‐naphtho[1β€²,2β€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