反応 #2839

反応方程式

Sodium hydride

n-butanol

hydrogen

2,5-Dibromopyridine

→

5-bromo-2-n-butoxypyridine

反応条件

後処理

1. 1
   workup.STIRRINGthe resulting mixture stirred
2. 2
   温度at reflux for 6 hours
3. 3
   温度After cooling
4. 4
   その他the n-butanal was removed by evaporation
5. 5
   workup.ADDITIONthe residue was treated with water (50 ml)
6. 6
   抽出extracted with dichloromethane (2×20 ml)
7. 7
   洗浄washed with water (20 ml)
8. 8
   乾燥dried (MgSO4)
9. 9
   その他evaporated

実験手順

Sodium hydride (60% w/v dispersion in mineral oil; 1.8 g) was added in portions over 20 minutes to n-butanol (100 ml) with stirring. The mixture was then stirred until no further hydrogen evolution was noted. 2,5-Dibromopyridine (7.1 g) was added and the resulting mixture stirred at reflux for 6 hours. After cooling, the n-butanal was removed by evaporation and the residue was treated with water (50 ml) and extracted with dichloromethane (2×20 ml). The organic extracts were combined, washed with water (20 ml), dried (MgSO4) and evaporated to give 5-bromo-2-n-butoxypyridine (6.3) as a pale yellow oil, NMR (DHSOd6): 0.9-0.96(3H, t), 1.32-1.5(2H, m), 1.62-1.76(2H, m), 4.2-4.28(2H, t), 6.79-6.82(1H, d), 7.85-7.9(1H, d of d) and 8.26(1H, d).

出典