Ag2Cr2O7 nanoparticles: An eco‐friendly and reusable catalyst for synthesis of pyranochromenediones and dioxolochromeneones in aqueous media at ambient temperature

An efficient and green protocol for the synthesis of 4‐aryl‐3,4‐dihydro‐2H,5H‐pyrano[3,2‐c]chromene‐2,5‐diones and 8‐aryl‐7,8‐dihydro‐6H‐[1,3]dioxolo[4,5‐g]chromene‐6‐ones through the Ag2Cr2O7 nanoparticles catalyzed cyclocondensation reaction of active methylene compounds including 4‐hydroxycoumari...

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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, Reza Kia‐Kojoori
Format: Article
Language:English
Subjects:
Aldehydes
Ambient temperature
Aqueous solutions
Aromatic compounds
Catalysts
Chemical synthesis
Nanoparticles
Silver dichromate
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Summary:An efficient and green protocol for the synthesis of 4‐aryl‐3,4‐dihydro‐2H,5H‐pyrano[3,2‐c]chromene‐2,5‐diones and 8‐aryl‐7,8‐dihydro‐6H‐[1,3]dioxolo[4,5‐g]chromene‐6‐ones through the Ag2Cr2O7 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