Facile synthesis of substituted 1H-pyrazolo[3,4-b]pyridines
摘要:
Substituted 1H-pyrazolo[3,4-b]pyridines were synthesised by construction of pyrazole ring from 4-substituted 5-acetyl-2-methyl-6-(methylamino)nicotinonitriles readily available via rearrangement of 3,5-dicyanopyridinium salts.