Abstract A one-pot, three-component condensation reaction of an aldehyde, 3-amino-5-methylpyrazole and ethyl cyanoacetate in ethanol to give 4-aryl-3-methyl-6-oxo-4,5,6,7-tetrahydro - 2 H - pyrazolo[3,4- b ]pyridine-5-carbonitriles, in high yields, at reflux, using a catalytic amount of p -toluenesulfonic acid, is described.

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