Ag 2 Cr 2 O 7 nanoparticles: An eco‐friendly and reusable catalyst for synthesis of pyrano[ c ]chromenediones and [1,3]dioxolo[ g ]chromeneones in aqueous media at ambient temperature

An efficient and green protocol for the synthesis of 4‐aryl‐3,4‐dihydro‐2 H ,5 H ‐pyrano[3,2‐ c ]chromene‐2,5‐diones and 8‐aryl‐7,8‐dihydro‐6 H ‐[1,3]dioxolo[4,5‐ g ]chromene‐6‐ones through the Ag 2 Cr 2 O 7 nanoparticles catalyzed cyclocondensation reaction of active methylene compounds including 4...

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Bibliographic Details
Published in:Journal of the Chinese Chemical Society (Taipei) 2020-10, Vol.67 (10), p.1895-1902
Main Authors: Ebrahimi, Mitra, Abdolmohammadi, Shahrzad, Kia‐Kojoori, Reza
Format: Article
Language:English
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Summary:An efficient and green protocol for the synthesis of 4‐aryl‐3,4‐dihydro‐2 H ,5 H ‐pyrano[3,2‐ c ]chromene‐2,5‐diones and 8‐aryl‐7,8‐dihydro‐6 H ‐[1,3]dioxolo[4,5‐ g ]chromene‐6‐ones through the Ag 2 Cr 2 O 7 nanoparticles catalyzed cyclocondensation reaction of active methylene compounds including 4‐hydroxycoumarin or 3,4‐methylenedioxyphenol, aromatic aldehydes, and meldrum's acid in water at ambient temperature was described. This method demonstrates several advantages compared with methods that are currently employed such as a mild reaction conditions, simple work‐up, good to excellent yields, avoiding toxic catalyst and hazardous solvent, and recovery and reuse of the catalyst.
ISSN:0009-4536
2192-6549
DOI:10.1002/jccs.201900488