3-(Dimethylamino)-1-phenyl-2-propen-1-one → 7-Phenylpyrazolo[1,5-a]pyrimidine-3-carboxylic acid ethyl ester

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Reaction Steps

A mixture of 17.5 g. of 3-dimethylaminoacrylophenone and 15.52 g. of 3-amino-4-carbethoxypyrazole in 50 ml. of glacial acetic acid is refluxed for 4 hours and then evaporated. The residue is treated as described in Example 1, giving the desired product, m.p. 129°-130° C.

Provenance & Evidence