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Tricyclic heterocyclic systems: Pyrazolo[5′,4′:4,5]-and pyrazolo-[3′,4′:4,5]pyrano[2,3-b]pyridine derivatives

✍ Scribed by Fabrizio Melani; Lucia Cecchi; Vittoria Colotta; Giovanna Palazzino; Guido Filacchioni

Book ID: 112129045
Publisher: Journal of Heterocyclic Chemistry
Year: 1988
Tongue: English
Weight: 288 KB
Volume: 25
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570250518

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## Abstract magnified image A series of pyrazolo[3,4‐__b__]pyridines has been synthesized by __Friedländer__ condensation of 5‐amino‐pyrazole‐4‐carbaldehyde **1** with active methylene compounds in basic medium. Pyrazolo[4′3′:5,6]pyrido‐[2,3‐__d__]pyrimidines have been synthesized from pyrazolo[3,