Dichloromethane → 5-Pentafluoroethyl-2-p-tolyl-2H-pyrazol-3-ylamine

反応式

[F:1][C:2]([F:12])([C:8]([F:11])([F:10])[F:9])[C:3](=O)[CH2:4][C:5]#[N:6].[C:13]1([CH3:21])[CH:18]=[CH:17][C:16]([NH:19][NH2:20])=[CH:15][CH:14]=1.ClCCl>C(O)C>[F:1][C:2]([F:12])([C:3]1[CH:4]=[C:5]([NH2:6])[N:19]([C:16]2[CH:17]=[CH:18][C:13]([CH3:21])=[CH:14][CH:15]=2)[N:20]=1)[C:8]([F:9])([F:11])[F:10]

参加物

実験手順

Heat a mixture of 4,4,5,5,5-pentafluoro-3-oxo-pentanenitrile (4.0 g, 21.4 mmol) and p-tolyl-hydrazine (10 g, 64.1 mmol) in ethanol (20 mL) to 95° C. in a sealed tube apparatus for 15 hours. After cooling to room temperature, remove the solvent under reduced pressure to give a yellow solid. Distribute the solid between dichloromethane (250 mL), distilled water (150 mL) and a saturated aq. sodium bicarbonate solution (50 mL). Isolate the aqueous phase and extract with dichloromethane (100 mL). Dry the combined organic phases over sodium sulfate and concentrate to give a dark gold oil. Subject oil to silica gel chromatography eluting with ethyl acetate and hexanes to give a light brown solid (3.24 g, 52% yield). MS(ES+): m/z=292.1 [M+H].