3-Dimethylamino-3'-trifluoromethylacrylophenone → Phenyl[7-[3-(trifluoromethyl)phenyl]pyrazolo[1,5-a]-pyrimidin-3-yl]methanon
Reaction equation
[NH2:1][C:2]1[C:6]([C:7]([C:9]2[CH:14]=[CH:13][CH:12]=[CH:11][CH:10]=2)=[O:8])=[CH:5][NH:4][N:3]=1.CN(C)[CH:17]=[CH:18][C:19]([C:21]1[CH:26]=[CH:25][CH:24]=[C:23]([C:27]([F:30])([F:29])[F:28])[CH:22]=1)=O>C(O)(=O)C>[C:9]1([C:7]([C:6]2[CH:5]=[N:4][N:3]3[C:19]([C:21]4[CH:26]=[CH:25][CH:24]=[C:23]([C:27]([F:28])([F:29])[F:30])[CH:22]=4)=[CH:18][CH:17]=[N:1][C:2]=23)=[O:8])[CH:10]=[CH:11][CH:12]=[CH:13][CH:14]=1Participants
4
Procedure
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.