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Volumn 3, Issue 48, 2013, Pages 25681-25685

Synthesis of pyranopyrazoles using isonicotinic acid as a dual and biological organocatalyst

Author keywords

[No Author keywords available]

Indexed keywords

ARYL ALDEHYDES; ETHYLACETOACETATE; HYDRAZINE HYDRATE; ISONICOTINIC ACID; MALONONITRILES; ORGANOCATALYSTS; PYRAZOLES; SOLVENT FREE CONDITIONS;

CARBOXYLIC ACIDS; CATALYSTS; CONDENSATION REACTIONS; HYDRATES;

PYRIDINE;

EID: 84887919493 PISSN: None EISSN: 20462069 Source Type: Journal
DOI: 10.1039/c3ra45289a Document Type: Article

Times cited : (123)

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- General procedure: a mixture of aromatic aldehyde (2 mmol), malononitrile (0.132 g, 2 mmol), ethyl acetoacetate (0.26 g, 2 mmol) hydrazine hydrate (2.5 mmol) and isonicotinic acid (0.2 mmol) (0.0246 g, 10 mol%) was added to a test tube, and stirred at 85 °C. After the completion of the reaction, as monitored by TLC, the reaction mixture was cooled to room temperature. Water was added to the reaction mixture to dissolve the catalyst and the aqueous layer was separated from the reaction mixture. Water was removed and the recovered catalyst was reused for up to four times without any significant changes in the yield and the reaction time. Afterward the solid residue (crude product) was triturated by a mixture of ethanol and water (9/1) to give the pure product
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