4-Bromo-[1,1'-biphenyl]-2-carboxylic acid → (4-Bromobiphenyl-2-yl)methanol
反応式
[Br:1][C:2]1[CH:3]=[C:4]([C:14](O)=[O:15])[C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)=[CH:6][CH:7]=1>C1COCC1.CCOC(C)=O>[Br:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:13]=[CH:12][CH:11]=[CH:10][CH:9]=2)=[C:4]([CH2:14][OH:15])[CH:3]=1参加物
4
反応条件
- 温度
- 0 °C
実験手順
4-bromobiphenyl-2-carboxylic acid (5.71 g, 20.61 mmol) was dissolved in THF (50 mL) and cooled to 0° C. 1.0M borane tetrahydrofuran complex (41.2 mL, 41.2 mmol) was added dropwise over 15 min. and allowed to warm up to r.t. overnight. The reaction was diluted with EtOAc and washed with water, sat. ammonium chloride, and then brine. The organic layer was collected, dried over MgSO4, filtered and evaporated to give the crude product. The crude product was purified by flash chromatography on the Biotage (5-35% EtOAc:Hex) to give (4-bromobiphenyl-2-yl)methanol (3.5 g, 13.30 mmol, 65% yield) as a light orange oil. LCMS: rt=1.43 min.; Phenomenex-Luna C-18 (5μ) (3.0×50 mm); Solvent A=10% acetonitrile—90% water—0.1% TFA, Solvent B=90% acetonitrile—10% water—0.1% TFA; gradient 0% to 100% solvent B over 2 min. and then hold for 1 min.; 4 mL/min; inj. vol.=5 uL; wavelength=220. 1H NMR (400 MHz, CHLOROFORM-d) δ ppm 4.60 (d, J=5.77 Hz, 2H) 7.15 (d, J=8.28 Hz, 1H) 7.29-7.35 (m, 2H) 7.36-7.46 (m, 3H) 7.48 (dd, J=8.28, 2.01 Hz, 1H) 7.75 (d, J=2.01 Hz, 1H).