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- W2950385502 abstract "A new class of pyrano[3,2-c]coumarins containing an aryloylgroup was synthesized via the three-component reactions of 4-hydroxycoumarin with arylglyoxals and malononitrile. The reactions are efficiently catalyzed by zinc oxide nanoparticles as powerful and recyclable catalyst. The green chemistry principles were also considered and the present method has some advantages, such as simplicity, low catalyst loading, and high yields. From the perspective of environmental problems, the avoidance of harmful organic solvents is one of the efficient ways to decrease the concerns in chemical research and industry. In regard of the fundamental principles of the green chemistry, the elimination of toxic solvents and the generation of waste are important items. In chemical reactions, transition metal oxides are commonly used due to their catalytic activity. Among the nano-sized transition metal oxides, zinc oxide nanoparticles (ZnO NPs) have gained tremendous importance as they exhibit interesting catalytic properties which cannot be achieved by their bulk counterparts. ZnO nanomaterials are non-toxic and water-insoluble material which can be recovered and reused, therefore, it can help to reduce the waste. The pyranocoumarins possess several types of pharmacological properties, such as anti-HIV, antibacterial, insecticidal, anticancer, and anti-inflammatory activities, thus, they have received considerable attention. Among pyranocoumarins, the pyrano[3,2-c]coumarins are the most synthetically feasible. Generally, pyrano[3,2-c]coumarins are affordable from commercially available 4-hydroxycoumarin with 1670 HETEROCYCLES, Vol. 89, No. 7, 2014" @default.
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- W2950385502 date "2014-01-01" @default.
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- W2950385502 title "One-pot Synthesis of Novel Pyrano-Fused Coumarins Catalyzed by ZnO Nanoparticles" @default.
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- W2950385502 doi "https://doi.org/10.3987/com-14-13006" @default.
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