A convenient synthetic approach to newly condensed pyrazoloazines based on pyrazolo[3,4-b]pyridine

The reaction of 6-amino-5-cyano-3-methyl-1H-1-phenylpyrazolo[3,4-b]pyridine (2) and 6,7-dihydro3-methyl-6-oxo-1H-1-phenylpyrazolo[3,4-b]pyridine-5-carbonitrile(3) and 5-amino-3-methyl-1-phenyl-1H-pyrazolo[3,4-b]-1H-pyrazolo[4',3'-e]pyridine (12) with different reagents have been conducted to give newly condensed pyrazoloazines.