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Synthesis of 4H-benzopyrans catalyzed by acyclic acidic ionic liquids in aqueous media

✍ Scribed by Dong Fang; Hua-Bin Zhang; Zu-Liang Liu

Publisher
Journal of Heterocyclic Chemistry
Year
2009
Tongue
English
Weight
78 KB
Volume
47
Category
Article
ISSN
0022-152X

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✦ Synopsis

Abstract

magnified image

Some halogen‐free acyclic task‐specific ionic liquids (TSILs) were synthesized as novel and recyclable catalysts for the synthesis of 5‐oxo‐5,6,7,8‐tetrahydro‐4H‐benzo[b]pyrans by one‐pot three‐component condensation of aromatic aldehyde, malononitrile (or ethyl cyanoacetate), and dimedone (or 1,3‐cyclohexanedione) in water. The condensation accomplished successfully with good yields ranged from 86 to 94%. After the reaction, the products could simply be separated from the catalyst/water, and the catalyst could be reused at least 10 times without noticeably decreasing the catalytic activity. J. Heterocyclic Chem., 2010.

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