3-Dimethylamino-3'-trifluoromethylacrylophenone → Phenyl[7-[3-(trifluoromethyl)phenyl]pyrazolo[1,5-a]-pyrimidin-3-yl]methanon

Participants

Reaction Steps

A reaction mixture of 1.87 g of (3-amino-1H-pyrazol-4-yl)phenyl-methanone and 2.43 g of 3-dimethylamino-1-[3-(trifluoromethyl)phenyl]-2-propen-1-one in 25 ml of glacial acetic acid was refluxed for 6 hours and then the solvent was removed in vacuo giving a crystalline residue. This residue was partitioned between saturated aqueous sodium bicarbonate and dichloromethane. The organic layer was dried with anhydrous sodium sulfate and then passed through a short pad of hydrous magnesium silicate. The addition of hexane to the refluxing eluate induced crystallization. After cooling, the desired product was collected as crystals, mp 148°-150° C.

Provenance & Evidence