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Synthesis of pyrazolo‐annelated heterocyclic ring compounds such as pyrazolo[3,4‐ b ]pyridines and pyrazolo[4′,3′:5,6]‐pyrido[2,3‐ d ]pyrimidines
Author(s) -
Jachak Madhukar N.,
Avhale Appasaheb B.,
Toche Ragunath B.,
Sabnis Ram W.
Publication year - 2007
Publication title -
journal of heterocyclic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.321
H-Index - 59
eISSN - 1943-5193
pISSN - 0022-152X
DOI - 10.1002/jhet.5570440210
Subject(s) - chemistry , acetic anhydride , ring (chemistry) , methylene , pyrazole , medicinal chemistry , condensation , pyridine , bicyclic molecule , stereochemistry , organic chemistry , catalysis , physics , thermodynamics
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[3,4‐ b ]pyridines using substituted urea and acetic anhydride.