Green synthesis of biscoumarin derivatives catalyzed by recyclable CuO–CeO2 nanocomposite catalyst in water

Recent Advances in the Synthesis of Biscoumarin Derivatives

“…Also, this catalyst could be used for the chemoselective synthesis of biscoumarins from aromatic aldehydes as well as aliphatic ones. Moreover, this catalyst had good efficiency (90% yield) even after five reruns (Table , entry 35) …”

“…Moreover, this catalyst had good efficiency (90% yield) even after five reruns ( Table 1, entry 35). 50 Various biscoumarins have been prepared in the presence of piperidine in EtOH at room temperature in high yields. Also, aliphatic and aromatic aldehydes reacted in this condition.…”

Click chemistry‐inspired design, synthesis, and molecular docking studies of biscoumarin derivatives using carbon‐based acid catalyst

“…The suitability of this catalyst and exhaustive literature survey for the synthesis of coumarin derivatives inspired us to search the applicability of this catalyst for the synthesis of biscoumarins. The literature studies showed their synthesis using different methods such as catalyst‐free microwave‐assisted organic synthesis, 28 [PSebim][OTf], 29 propane‐1,2,3‐triyl tris(hydrogen sulfate), 30 phospho sulfonic acid, 31 W‐doped ZnO nanocomposite, 32 choline hydroxide, 33 o ‐benzenedisulfonimide, 34 P4VPy‐CuO‐NPs, 35 sulfonated rice husk ash, 36 piperidine, 37 magnetite‐containing sulfonated polyacrylamide, 38 CuO‐CeO 2 nanocomposite, 39 Montmorillonite K10·Ni0‐Mont, 40 taurine, 41 VB1, 42 cerric ammonium nitrate, 43 HY‐Zeolite, 44 FeNi 3 ‐ILs nanoparticles, 45 and so on and high yields were obtained. A comprehensive review on the synthesis of biscoumarin derivatives has recently been published 46 and it was found that the reported methods have their own merits coupled with endure drawbacks, that is, costly, tedious work up procedures, formation of toxic by‐products, use of toxic solvents, and so on.…”

Highly selective aerobic oxidation of alkylarenes catalyzed by cobalt‐based nanocatalyst in aqueous solution

“…[27] To the best of our knowledge, the performance of cobalt nanocatalysts supported on γ-alumina has not been investigated for organic synthesis reactions, especially for the oxidation of alkylarenes. Therefore, in continuation of our studies of the catalytic activity of various nanocatalysts in aerobic oxidation reactions, [28][29][30][31][32][33][34] herein the performance of a Co nanocatalyst supported on a highly crystalline γ-Al 2 O 3 support is reported for the aerobic oxidation of alkylarenes to their corresponding ketones (Scheme 1).…”