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
Authors:
- 13 March 2007
- journal article
- research article
- Published by Wiley in Journal of Heterocyclic Chemistry
- Vol. 44 (2) , 343-347
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[3,4‐b]pyridines using substituted urea and acetic anhydride.Keywords
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