反応 #7468

反応方程式

ammonium chloride

n-butyllithium

isopropyltriphenylphosphonium iodide

methyl terephthalaldehydate

→

methyl 4-(2-methylprop-1-en-1-yl)benzoate

収率 88.9%

溶媒

tetrahydrofuran

tetrahydrofuran

反応条件

後処理

1. 1
   workup.STIRRINGthe mixture was stirred at room temperature for 3 hours
2. 2
   抽出the mixture was extracted with diethyl ether
3. 3
   乾燥The organic layer was dried over anhydrous magnesium sulfate
4. 4
   その他the solvent was removed under reduced pressure
5. 5
   その他The residue was purified by column chromatography on aminopropyl silica gel (eluent: hexane/ethyl acetate=3/1)

実験手順

To a suspension of isopropyltriphenylphosphonium iodide (9.5 g) in tetrahydrofuran (90 mL) was added n-butyllithium (1.5 mol/L hexane solution, 15 mL) at 0° C., and the mixture was stirred for 15 minutes. To the reaction mixture was added a solution of methyl terephthalaldehydate (3.3 g) in tetrahydrofuran (10 mL), and the mixture was stirred at room temperature for 3 hours. The reaction mixture was poured into a saturated aqueous ammonium chloride solution, and the mixture was extracted with diethyl ether. 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 aminopropyl silica gel (eluent: hexane/ethyl acetate=3/1) and then by column chromatography on silica gel (eluent: dichloromethane/ethyl acetate=10/1) to give methyl 4-(2-methylprop-1-en-1-yl)benzoate (3.4 g). To a suspension of lithium aluminum hydride (0.68 g) in diethyl ether (120 mL) was added a solution of methyl 4-(2-methylprop-1-en-1-yl)benzoate (3.4 g) in diethyl ether (30 mL) at 0° C., and the mixture was heated under reflux for 50 minutes. After the reaction mixture was cooled to 0° C., water (0.69 mL), 15% aqueous sodium hydroxide solution (0.69 mL) and water (2 mL) were added, and the mixture was stirred at room temperature for 30 minutes. Insoluble materials were removed by filtrate, and the solvent of the filtrate was removed under reduced pressure. The residue was purified by column chromatography on silica gel (eluent: hexane/ethyl acetate=4/1-2/1) to give 4-(2-methylprop-1-en-1-yl)benzyl alcohol (2.8 g).

出典