Formamide → 3-Methyl-pyrazolo[3,4-d]pyrimidin-4-one

Participants

Reaction Conditions

Reaction Steps

A mixture of 5-amino-3-methyl-1H-pyrazole-4-carboxylic acid amide (11.06 g, 79.0 mmol, Example 1) and formamide (60 mL, Aldrich) was heated at 180° C. for 3.5 hours. After cooling to 80° C., icy water (100 g) was added and the mixture was vigorously stirred to give a white precipitate. The precipitate was filtered and washed with cold water and then dried in a vacuum desiccator to give 3-methyl-pyrazolo[3,4-d]pyrimidin-4-one as an off-white solid. (Yield 9.07 g). This material was used in the next step (described in Example 3) without further purification.

Provenance & Evidence