反応 #1766

反応方程式

methyl 2,4-dihydroxybenzoate

K2CO3

benzyl bromide

→

methyl 4-benzyloxy-2-hydroxybenzoate

溶媒

acetone

反応条件

後処理

1. 1
   ろ過The reaction solution was filtered through celite
2. 2
   workup.DISSOLUTIONThe crude oil was dissolved in EtOAc (1000 mL)
3. 3
   洗浄washed with water (250 mL), and saturated aqueous NaHCO3 (500 mL)
4. 4
   乾燥The EtOAc layer was dried (MgSO4)
5. 5
   ろ過filtered
6. 6
   その他the EtOAc was removed under reduced pressure
7. 7
   その他The crude product was purified by pressurized silica gel column chromatography
8. 8
   その他Evaporation of the hexanes

実験手順

To a stirred, 0° C. solution of methyl 2,4-dihydroxybenzoate (50 g, 300 mmol) in acetone (1000 mL) was added K2CO3 (150 g, 1000 mmol) and benzyl bromide (330 mmol, 39 mL). The solution was allowed to warm to ambient temperature over 48 h. The reaction solution was filtered through celite and the acetone solution stripped down under reduced pressure. The crude oil was dissolved in EtOAc (1000 mL) and washed with water (250 mL), and saturated aqueous NaHCO3 (500 mL). The EtOAc layer was dried (MgSO4), filtered, and the EtOAc was removed under reduced pressure. The crude product was purified by pressurized silica gel column chromatography using 5:1 hexanes:EtOAc. Evaporation of the hexanes:EtOAc mixture gave the desired methyl 4-benzyloxy-2-hydroxybenzoate as a white powder.

出典