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Ag/Fe 3 O 4 /TiO 2 /CuO@MWCNTs magnetic nanocomposites were synthesized by the  Petasites hybridus  rhizome water extract as green media and used for one-pot multicomponent reaction of isatins, electron deficient acetylenic compounds, α-haloketones, ammonium acetate,  tert -butyl isocyanide and ethyl bromopyruvate in aqueous media at room temperature for the production of novel derivatives of oxazolopyrimidoazepines in excellent yields. The synthesized oxazolopyrimidoazepines have OH and NH functional groups that have acidic hydrogen and show high antioxidant activity. Moreover, reduction of organic pollutants such 4-nitrophenol (4-NP) was performed by synthesized Ag/Fe 3 O 4 /TiO 2 /CuO@MWCNTs in water at room temperature. The outcomes showed this catalyst was decreased organic pollutants in few seconds. The employed process for the production of oxazolopyrimidoazepines has some benefits such as short time of reactions, excellent efficiency of product, easy separation of catalyst and products. HIGHLIGHTS Green chemistry is the use of a set of principles to reduce or eliminate the use or generation of unsafe materials in the design, fabrication and applications of chemical products. Among solvents, water is a green solvents and very suitable for performing organic reaction.The present procedure avoids the use of toxic solvent.Some representatives of this class of azaheterocycles are known as antiviral agents, glycosidase inhibitors, anticancer agents or antidiabetics. Therefore, in view of their medicinal relevance, an increasing number of synthetic methods have been described in recent years for the construction of highly substituted azepine derivatives. Green chemistry is the use of a set of principles to reduce or eliminate the use or generation of unsafe materials in the design, fabrication and applications of chemical products. Among solvents, water is a green solvents and very suitable for performing organic reaction. The present procedure avoids the use of toxic solvent. Some representatives of this class of azaheterocycles are known as antiviral agents, glycosidase inhibitors, anticancer agents or antidiabetics. Therefore, in view of their medicinal relevance, an increasing number of synthetic methods have been described in recent years for the construction of highly substituted azepine derivatives.

polycyclic aromatic compounds

Synthesis and Biological Activity Investigation of New Oxazolopyrimidoazepine Derivatives: Application of Ag/Fe 3 O 4 /TiO 2 /CuO@MWCNTs MNCs in the Reduction of Organic Pollutants