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Synthesis of 4 H ‐benzopyrans catalyzed by acyclic acidic ionic liquids in aqueous media
Author(s) -
Fang Dong,
Zhang HuaBin,
Liu ZuLiang
Publication year - 2010
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.254
Subject(s) - chemistry , malononitrile , dimedone , catalysis , ionic liquid , aldehyde , benzopyrans , condensation , aqueous solution , organic chemistry , aqueous medium , barbituric acid , combinatorial chemistry , thermodynamics , physics
AbstractSome 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.