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An efficient synthesis of pyrazolo[3,4‐ b ]quinolin‐5(6 H )‐one derivatives in ionic liquid
Author(s) -
Shi DaQing,
Yang Fang
Publication year - 2011
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.538
Subject(s) - chemistry , ionic liquid , catalysis , reaction conditions , aryl , organic chemistry , component (thermodynamics) , ionic bonding , medicinal chemistry , combinatorial chemistry , ion , alkyl , physics , thermodynamics
A series of 4‐aryl‐3,7,7‐trimethyl‐1‐phenyl‐7,8‐dihydro‐1 H ‐pyrazolo[3,4‐ b ]quinolin‐5(6 H )‐ones were synthesized via the three‐component reaction of aromatic aldehydes, 5,5‐dimethyl‐1,3‐cyclohexandione and 5‐amino‐3‐methyl‐1‐phenylpyrazole in ionic liquid without using any catalyst. This protocol has the advantages of easier work‐up, milder reaction conditions, short reaction time, and environmentally benign procedure. J. Heterocyclic Chem., (2011).