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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
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 dihy...
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Published in: | Applied organometallic chemistry 2018-04, Vol.32 (4) |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | 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. |
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ISSN: | 0268-2605 1099-0739 |
DOI: | 10.1002/aoc.4235 |