Trifluoroacetic acid → 6-acetyl-4-(2-chlorophenyl)-2,4-dihydro-1H-pyrazolo[3,4-b]pyridine-5-carbonitrile

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Reaction Steps

4-(2-Chlorophenyl)-5-cyano-4,7-dihydro-6-(1,1-dimethoxyethyl)-2H-pyrazolo[3,4-b]pyridine was prepared from methyl 2,2-dimethoxypropionate, 2-chlorobenzaldehyde and 3-aminopyrazole in the same manner as in Example 1001. To a solution of 4-(2-chlorophenyl)-5-cyano-4,7-dihydro-6-(1,1-dimethoxyethyl)-2H-pyrazolo[3,4-b]pyridine (1.0 g) in dichloromethane (10 mL) was added a trifluoroacetic acid (10 mL) under ice-cooling and the mixture was stirred under ice-cooling for 1 hour. The solvent was evaporated and the obtained residue was crystallized from ethyl acetate to give the title compound (370 mg) as white crystals.

Provenance & Evidence