5-Bromo-2-fluoro-3-pyridinecarboxaldehyde → 1-(5-Bromo-2-fluoropyridin-3-yl)ethanol
反応式
[Br:1][C:2]1[CH:3]=[N:4][C:5]([F:10])=[C:6]([CH:9]=1)[CH:7]=[O:8].[CH3:11][Mg]Br>C1COCC1>[Br:1][C:2]1[CH:9]=[C:6]([CH:7]([OH:8])[CH3:11])[C:5]([F:10])=[N:4][CH:3]=1参加物
4
実験手順
To a solution of 5-bromo-2-fluoronicotinaldehyde (10 g, 49 mmol) in THF (100 mL) at −78° C. was added dropwise methylmagnesium bromide (3.0 M solution in diethyl ether, 24.5 mL, 73.5 mmol). After the addition, the reaction was warmed to room temperature and stirred for 17 h. The mixture was carefully quenched with saturated ammonium chloride and extracted with EtOAc. The combined organic extracts were washed with brine, dried over Na2SO4, filtered, and concentrated. Purification by flash column chromatography on silica gel (eluted with 0-10% EtOAc/hexanes) gave 1-(5-bromo-2-fluoropyridin-3-yl)ethanol (10.8 g, 49.1 mmol, 100% yield) as a yellow oil. LC/MS (ESI+) m/z=220 (M+H).