Pyridine → 2-(4-Fluorophenyl)-5-oxo-3-(pyridin-4-yl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine

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Reaction Steps

A mixture of 5-amino-3-(4-fluorophenyl)-4-(pyridin-4-yl)pyrazole (1.016 g), methyl acrylate (10 ml), pyridine (20 ml) and water (5 ml) was refluxed for 8 hours. The mixture was cooled and concentrated in vacuo. The residue was dissolved in a mixture of acetic acid (10 ml) and concentrated hydrochloric acid (1.5 ml). The solution was refluxed for 2 hours, cooled and neutralized with an aqueous saturated sodium bicarbonate solution. The separated solid was collected, washed with water and dried to give 2-(4-fluorophenyl)-5-oxo-3-(pyridin-4-yl)-4,5,6,7-tetrahydropyrazolo[1,5-a]pyrimidine (750 mg).

Provenance & Evidence