3-Dimethylamino-1-thien-3-ylpropen-1-one → Ethyl 7-(3-thienyl)pyrazolo[1,5-a]pyrimidine-3-carboxylate

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Reaction Steps

As for Example 2, 3.10 g. of 3-amino-4-carboethoxypyrazole is heated at reflux temperature for 10 hours with 3.62 g. of 3-dimethylamino-1-(3-thienyl)-2-propen-1-one in 25 ml. of glacial acetic acid to give 4.40 g. of the product of the example as tan crystals, m.p. 129°-130° C.

Provenance & Evidence