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ONE-POT THREE-COMPONENT SYNTHESIS OF A SERIES OF 4-AROYL-1,6-DIARYL-3-METHYL-1H-PYRAZOLO[3,4-b]PYRIDINE-5-CARBONITRILES IN THE PRESENCE OF ALUMINUM OXIDE AS A NANOCATALYST
Abstract
One-pot three-component reaction of arylglyoxals, 3-aryl- 3-oxopropanenitriles, and 5-amino-1-aryl-3-methylpyrazoles using various
solvent systems and different catalysts under reflux conditions afforded the corresponding 4-aroyl-1,6-diaryl-3-methyl-1H-pyrazolo[3,4-b]-
pyridine-5-carbonitrile derivatives. The best yields (70–91%) were obtained using Al2O3 as a nanocatalyst in H2O–EtOH, 1:1, under reflux conditions. The simplicity of workup procedure, the novelty of pyrazolopyridines, green solvent system, easy preparation of a nanocatalyst, and good to excellent yields of the products are the advantages of this synthetic strategy. The structures of all products were confirmed by FT-IR, 1H and 13C NMR, and mass spectral data.
solvent systems and different catalysts under reflux conditions afforded the corresponding 4-aroyl-1,6-diaryl-3-methyl-1H-pyrazolo[3,4-b]-
pyridine-5-carbonitrile derivatives. The best yields (70–91%) were obtained using Al2O3 as a nanocatalyst in H2O–EtOH, 1:1, under reflux conditions. The simplicity of workup procedure, the novelty of pyrazolopyridines, green solvent system, easy preparation of a nanocatalyst, and good to excellent yields of the products are the advantages of this synthetic strategy. The structures of all products were confirmed by FT-IR, 1H and 13C NMR, and mass spectral data.
Keywords
arylglyoxals, pyrazolo[3,4-b]pyridines, multicomponent reaction, nanocatalyst, one-pot reaction
Latvian Institute of Organic Synthesis - Aizkraukles iela, 21, Riga, LV-1006, Latvia - hgs@osi.lv