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Polypyrrole/Fe 3 O 4 /CNT as a recyclable and highly efficient catalyst for one‐pot three‐component synthesis of pyran derivatives
Author(s) -
Hojati Seyedeh Fatemeh,
Amiri Amirhassan,
MoeiniEghbali Nasrin,
Mohamadi Sakineh
Publication year - 2018
Publication title -
applied organometallic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.53
H-Index - 71
eISSN - 1099-0739
pISSN - 0268-2605
DOI - 10.1002/aoc.4235
Subject(s) - malononitrile , pyran , chemistry , dimedone , ethyl acetoacetate , catalysis , multi component reaction , aldehyde , one pot synthesis , organic chemistry , condensation reaction , polymer chemistry
Polypyrrole (PPY)/Fe 3 O 4 /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. Tetrahydrobenzo[ b ]pyranes, 4H‐pyran‐3‐carboxylates, 4H,5H‐pyrano[3,2‐ c ]chromenes and dihydropyrano[2,3‐ 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/Fe 3 O 4 /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‐benzo[ b ]pyran from terephthalaldehyde can be achieved by this method.