Boron tribromide → HCID 90417900、化合物
反応式
C[O:2][C:3]1[C:8]([C:9]([F:12])([F:11])[F:10])=[CH:7][C:6]([CH2:13][CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:5][C:4]=1[C:20]([F:23])([F:22])[F:21].B(Br)(Br)Br>ClCCl>[OH:2][C:3]1[C:4]([C:20]([F:21])([F:22])[F:23])=[CH:5][C:6]([CH2:13][CH2:14][C:15]([O:17][CH2:18][CH3:19])=[O:16])=[CH:7][C:8]=1[C:9]([F:10])([F:11])[F:12]参加物
4
実験手順
Into a 50-mL round-bottom flask (1 atm) purged and maintained with an inert atmosphere of nitrogen, was placed ethyl 3-[4-methoxy-3,5-bis(trifluoromethyl)phenyl]propanoate (270 mg, 0.78 mmol, 1.00 equiv), dichloromethane (5.0 mL). That was followed by adding BBr3 (1N in dichloromethane) (1.57 mL) dropwise at −78 degree C. The resulting solution was warmed to room temperature and stirred for 2 h at 25° C. The reaction progress was monitored by LCMS. The reaction was then quenched by the addition of 5 mL of water, extracted with 3×10 mL of dichloromethane and the organic layers combined and dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was applied onto a silica gel column with ethyl acetate/petroleum ether (1:4). This resulted in 0.15 g (58%) of ethyl 3-[4-hydroxy-3,5-bis(trifluoromethyl)phenyl]propanoate as yellow oil. Mass spectrum (ESI, m/z): Calcd. for C13H12F6O3, 329.1 (M−H). found 329.1.