학술논문
H14 [NaP5 W30 O110 ] Catalyzed One-Pot Three-Component Synthesis of Dihydropyrano[2,3-c]pyrazole and pyrano[2,3-d]pyrimidine Derivatives.
Document Type
Article
Source
Subject
*CATALYSTS
*PYRAZOLES
*PYRIMIDINES
*ALDEHYDES
*PHYSICAL & theoretical chemistry
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Language
ISSN
1735-207X
Abstract
This is a report of an efficient, clean and facile method for the synthesis of 1,4-dihydropyrano[2,3-c] pyrazole and pyrano[2,3- d]pyrimidine derivatives via three-component one-pot condensation of 3-methyl-1-phenyl-1H-pyrazol-5(4H)-one or barbituric acid, aldehydes and malononitrile in the presence of a catalytic amount of preyssler type heteropolyacid as a green and reusable catalyst in water or ethanol under refluxing conditions. [ABSTRACT FROM AUTHOR]