反応 #7460

反応方程式

hydrochloric acid

triisopropyl borate

1-bromo-4-[(methoxymethyloxy)methyl]benzene

n-butyllithium

→

4-[(methoxymethyloxy)methyl]phenylboric acid

収率 90.8%

溶媒

tetrahydrofuran

反応条件

後処理

1. 1
   workup.STIRRINGthe mixture was stirred at room temperature for 1 hour
2. 2
   抽出the mixture was extracted with ethyl acetate
3. 3
   洗浄The organic layer was washed with water
4. 4
   乾燥dried over anhydrous magnesium sulfate
5. 5
   その他the solvent was removed under reduced pressure

実験手順

To a solution of 1-bromo-4-[(methoxymethyloxy)methyl]benzene (3.0 g) in tetrahydrofuran (52 mL) was added n-butyllithium (1.6 mol/L hexane solution, 9.3 mL) at −78° C., and the mixture was stirred for 30 minutes. To the reaction mixture was added triisopropyl borate (2.6 g), and the mixture was stirred at room temperature for 1 hour. To the reaction mixture was added 1 mol/L hydrochloric acid solution, and the mixture was extracted with ethyl acetate. The organic layer was washed with water and dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure to give 4-[(methoxymethyloxy)methyl]phenylboric acid (2.5 g). A mixture of the obtained 4-[(methoxymethyloxy)methyl]phenylboric acid (2.5 g), 2-bromothiazole (1.2 g), cesium fluoride (2.2 g) and tetrakis(triphenylphosphine)palladium (0) (0.16 g) in 1,2-dimethoxyethane (40 mL), ethanol (10 mL) and water (10 mL) was stirred at 85° C. for 24 hours. The reaction mixture was concentrated under reduced pressure, and to the residue was added water, and the mixture was extracted with diethyl ether. The organic layer was washed with water and dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: hexane/ethyl acetate=5/1) to give 2-{4-[(methoxymethyloxy)methyl]phenyl}thiazole (0.80 g). To a solution of 2-{4-[(methoxymethyloxy)methyl]phenyl}thiazole (0.80 g) in ethanol (10 mL) was added 2 mol/L hydrochloric acid solution (5 mL), and the mixture was stirred at 50° C. for 5 hours. Concentrated hydrochloric acid (0.10 mL) was added to the mixture, and the mixture was stirred for 1 hour. To the reaction mixture was added water, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and the solvent was removed under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: hexane/ethyl acetate=2/1-1/1) to give 4-(thiazol-2-yl)benzyl alcohol (0.33 g).

出典