3-amino-5-methyl-1H-pyrazole-4-carbonitrile → 2,6-Dimethyl-7-(3-pyridyl)pyrazolo[1,5-a]pyrimidine-3-carbonitrile

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Reaction Steps

A mixture of 1.90 g. of 3-dimethylamino-2-methyl-1-(3-pyridyl)-2-propen-1-one and 1.22 g. of 3-amino-5-methylpyrazole-4-carbonitrile in 25 ml. of glacial acetic acid is refluxed for 6 hours. The solvent is removed in vacuo and the residue partitioned between dichloromethane and saturated sodium bicarbonate solution. The dichloromethane layer is separated, dried over anhydrous sodium sulfate and passed through a column of hydrous magnesium silicate. The eluent is concentrated and hexane added to give 0.95 g. of the product of the example, m.p. 207°-209° C.

Provenance & Evidence