Synthesis of Pyrazolopyridine 3-Carboxylates by Friedlander Condensation

[摘要]：A series of 1,3,6-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-aminoaldehycle, which undergo facile condensation with various alpha-methylene ketones, nitriles, and esters, furnish fused pyridine derivative in good yield.

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