Trimethyl borate → (2-Chloro-5-isopropylphenyl)boronic acid
反応式
Br[C:2]1[CH:7]=[C:6]([CH:8]([CH3:10])[CH3:9])[CH:5]=[CH:4][C:3]=1[Cl:11].C([Li])CCC.[B:17](OC)([O:20]C)[O:18]C>C1COCC1>[Cl:11][C:3]1[CH:4]=[CH:5][C:6]([CH:8]([CH3:10])[CH3:9])=[CH:7][C:2]=1[B:17]([OH:20])[OH:18]参加物
5
反応条件
- 温度
- -78 °C
実験手順
To a solution of 2-bromo-1-chloro-4-isopropylbenzene (0.37 g, 1-59 mmol) in dry THF (5 mL) at −78° C., n-butyl lithium (0.76 mL, 1.90 mmol, 2.5 M) was added. The solution was stirred at −78° C. for 30 min. Trimethyl borate (0.53 mL, 4.76 mmol) was added. The solution was stirred at −78° C. for 2.5 h. The reaction was quenched with saturated aqueous NH4Cl. The aqueous layer was extracted with EtOAc (3×15 mL). The combined EtOAc layers were dried over Na2SO4. The residue was used without further purification after evaporation of the solvent.