Synthesis of pyrazolopyridine 3-carboxylates by Friedlander condensation
作者:Raghunath B. Toche、Dinesh C. Bhavsar、Muddassar A. Kazi、Sandeep M. Bagul、Madhukar N. Jachak
DOI:10.1002/jhet.294
日期:——
6‐trisubstituted and 1,3,5,6‐tetrasubstituted pyrazolo [3,4‐b] pyridines 5 have been synthesized by series of reactions on 1‐phenyl‐3‐carboxylate pyrazolone to obtain o‐aminoaldehyde, which undergo facile condensation with various α‐methylene ketones, nitriles, and esters, furnish fused pyridine derivative in good yield. J. Heterocyclic Chem., (2010).