Tetramethoxypropane → Phenylpyrazolo[1,5-a]pyrimidin-3-yl-methanone

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A mixture of 1.87 g of (3-amino-1H-pyrazol-4-yl)phenylmethanone (prepared as described in U.S. Patent application Ser. No. 612,811, filed May 24, 1984), 1.64 g of malonaldehyde bis(dimethyl acetal) and 25 ml of glacial acetic acid was heated at reflux for 6 hours. The solvent was evaporated and the solid was worked up as described in Example 50 and gave 1.70 g of phenylpyrazolo[1,5-a]pyrimidin-3-yl-methanone, mp 174°-175° C.

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