Aqua-mediated multicomponent synthesis of various 4H-pyran derivatives catalyzed by poly(4-vinylpyridine)-supported copper iodide nanoparticle catalyst

Copper‐Decorated Magnetite Polydopamine Composite (Fe3O4@PDA): An Effective and Durable Heterogeneous Catalyst for Pyranopyrazole Synthesis

“…[49] The synthesis of the catalyst is very easy [50] and its raw materials are easily available and most of them are also nontoxic. [51] In addition to being non-toxic and cheap, this catalyst has the advantage of its stability, which allows it to be reused ChemistrySelect up to 6 times in the reaction, and also increases the efficiency of the reaction tremendously with a smaller amount. [52] The amount of TON and TOF is better than other catalysts, which shows its effectiveness.…”

New Role for Photoexcited Na2 Eosin Y via the Direct Hydrogen Atom Transfer Process in Photochemical Visible-Light-Induced Synthesis of 2-Amino-4H-Chromene Scaffolds Under Air Atmosphere

“…Several multicomponent reactions for manufacturing 2-amino-4 H -chromene scaffolds have been described against various catalysts such as glycine ( Datta and Pasha, 2012 ), mesolite ( Pawar et al, 2018 ), potassium phthalimide ( Dekamin and Eslami, 2014 ), MgFe 2 O 4 NPs ( Eshtehardian et al, 2020 ), POM@Dy-PDA ( Hosseinzadeh-Baghan et al, 2020 ), P4VPy-CuI ( Albadi and Mansournezhad, 2016 ), nanozeolite clinoptilolite ( Baghbanian et al, 2013 ), water extract of lemon fruit shell ash (WELFSA) ( Kantharaju and Khatavi, 2018 ), tungstic acid functionalized SBA-15 ( Kundu et al, 2013 ), MIL-101(Cr)-SO 3 H ( Saikia and Saikia, 2016 ) [Et 2 NH(CH 2 ) 2 CO 2 H][AcO] ( Shaikh et al, 2019 ), {[4,4′-BPyH][C(CN) 3 ] 2 } ( Zolfigol et al, 2016 ), DBU ( Raghuvanshi and Singh, 2010 ), and hydrotalcite ( Kale et al, 2013 ). Several cases arose from these surgeries.…”

One‐pot Synthesis of 2‐Amino‐4H‐chromenes Derivatives in Aqueous Solution of Choline Hydroxide

“…So, the synthesis for the derivatives of 2‐amino‐4H‐chromenes has received great attention and many methods have been developed for this purpose, [20] in which, the MCR synthesis strategies based on the reaction of malononitrile, aromatic aldehydes and phenols have showed great attraction due to its efficient construction of several new chemical bonds in a one‐pot with high atom efficiency. Various catalytic systems have been developed for this conversion, like Fe(HSO 4 ) 3 , [21] MeSO 3 H, [22] p‐toluenesulfonic acid, [23] heteropolyacid, [24] sulfonic acid functionalized PEG, [25] sulfonic acid functionalized silica, [26] tungstic acid functionalized mesoporous SBA‐15, [27] iodine, [28] and nanosized MgO, [29] hydrotalcite, [30] DBU, [31] Et 3 N, [32] 4‐dimethylaminopyridine, [33] DABCO entrapped in agar, [34] amino‐appended cyclodextrin, and CoFe 2 O 4 , CuO/CeO 2 , supported copper iodide, Bimetallic PdRu/graphene oxide [35] . These catalysts have made structurally diverse synthesis of 2‐amino‐4H‐Chromene derivatives with satisfactory isolated yields, but most of them suffered from high reaction temperature, utilization of hazard volatile organic solvents or expensive metal precursors, and as we know, even trace residual of transition metals in final products will lead to the undesired harmful effects towards human health.…”