Polypyrrole/Fe3O4/CNT as a recyclable and highly efficient catalyst for one‐pot three‐component synthesis of pyran derivatives |
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Authors: | Seyedeh Fatemeh Hojati Amirhassan Amiri Nasrin MoeiniEghbali Sakineh Mohamadi |
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Institution: | Department of Chemistry, Hakim Sabzevari University, Sabzevar, Iran |
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Abstract: | Polypyrrole (PPY)/Fe3O4/CNT has been synthesized and characterized by FT‐IR, TEM and SEM techniques and its catalytic activity has been evaluated in the synthesis of several series of pyran derivatives. Tetrahydrobenzob]pyranes, 4H‐pyran‐3‐carboxylates, 4H,5H‐pyrano3,2‐c]chromenes and dihydropyrano2,3‐c]pyrazoles have been successfully prepared from one‐pot three‐component condensation of aldehyde, malononitrile and active methylene‐containing compounds (dimedone /ethyl acetoacetate/4‐hydroxycoumarin/3‐methyl‐2‐pyrazoline‐5‐one) using PPY/Fe3O4/CNT as a new and reusable heterogeneous catalyst. The present method offer several advantages such as; high yields of products, short reaction times, easy work‐up procedure and easy separation of the catalyst from the reaction mixture due to its magnetic character. Furthermore, chemoselective synthesis of bis‐benzob]pyran from terephthalaldehyde can be achieved by this method. |
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Keywords: | one‐pot synthesis polypyrrole/Fe3O4/CNT nanocomposite pyran derivatives three‐component reaction |
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