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Convenient synthesis of pyrazolo[3,4-b]pyridin-3-ones and pyrazolo[3,4-b]pyridine-5-carbaldehyde using vinamidinium salts

✍ Scribed by Chtiba Samar; Jemmezi Fayçel; Khiari Jameleddine

Publisher
Elsevier Science
Year
2011
Tongue
French
Weight
255 KB
Volume
52
Category
Article
ISSN
0040-4039

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✦ Synopsis

An expedient method for the synthesis of 2-phenyl-5-aryl-2,3-dihydropyrazolo [3,4-b]pyridin-3-ones and 2-phenyl-3-oxo-2,3-dihydropyrazolo[3,4-b]pyridine-5-carbaldehyde in a single-step via condensation of vinamidinium salts with 3-amino-1-phenyl-2-pyrazolin-5-one is described.

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## Abstract While 3(5)‐aminopyrazole reacts with enaminonitrile to yield pyrazolo[1,5‐__a__]pyrimidines, 3‐amino‐5‐pyrazolone reacts with the same reagents to yields pyrazolo[3,4‐__b__]pyridines.

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