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Title: Facile synthesis of 3-(4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)-1-phenyl-1 H-pyrazole-4-carbaldehyde and its condensation with various active methylene groups
Authors: Venkateshwarlu, P
Dubey, P K
Keywords: Phenylhydrazine;3-methyl-1H-pyrazole-5(4H)-one;3-methyl-1-phenyl-pyrazole-5(4H)-one;Meldrum’s acid;Barbituric acid
Issue Date: Sep-2017
Publisher: NISCAIR-CSIR, India
Abstract: Vilsmeier-Haack formylation of 3-acetyl-4H-pyrido[1,2-a]pyrimidin-4-one 5a-b gives thepyrazole aldehyde i.e.,3-(4-oxo-4H-pyrido[1,2-a]pyrimidin-3-yl)-1-phenyl-1H-pyrazole-4-carbaldehyde 6a-b which on condensation with various active methylene group containing compounds 7-10 gives the corresponding Knoevenagel products i.e., 11a,b-14a,b respectively. Structures of all the Knoevenagel products are assigned based on spectral and analytical data.
Page(s): 984-989
ISSN: 0975-0983(Online); 0376-4699(Print)
Appears in Collections:IJC-B Vol.56B(09) [September 2017]

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