反応 #86227

反応方程式

2,6-dibromopyridine

n-BuLi

hexane

tert-butyl 4-oxoazepane-1-carboxylate

→

tert-butyl 4-(6-bromopyridin-2-yl)-4-hydroxyazepane-1-carboxylate

収率 64.1%

溶媒

H2O

Et2O

Et2O

反応条件

後処理

1. 1
   workup.STIRRINGAfter the mixture was stirred for one hour, to it
2. 2
   抽出The aqueous layer was extracted with EtOAc (100 mL×2)
3. 3
   洗浄The combined organic layers were washed with 10% solution of NaOH and brine
4. 4
   乾燥dried over MgSO4
5. 5
   濃縮concentrated under reduced pressure
6. 6
   その他The crude product was purified by silica gel chromatography
7. 7
   洗浄as eluting solvents

実験手順

To a solution of 2,6-dibromopyridine (0.2 g, 0.84 mmol) in Et2O (20 mL) at −78° C. was added 2.5 M solution of n-BuLi in hexane (3.7 mL, 0.928 mmol) over 30 min. The mixture was stirred at −78° C. for 30 minutes. To it was dropped tert-butyl 4-oxoazepane-1-carboxylate (180 mg, 084 mmol) in Et2O (20 mL) over 15 minutes. After the mixture was stirred for one hour, to it was added H2O (100 mL). The aqueous layer was extracted with EtOAc (100 mL×2). The combined organic layers were washed with 10% solution of NaOH and brine, dried over MgSO4, concentrated under reduced pressure. The crude product was purified by silica gel chromatography using petroleum ether/EtOAc (9:1) as eluting solvents to afford tert-butyl 4-(6-bromopyridin-2-yl)-4-hydroxyazepane-1-carboxylate as an oil (200 mg, 62.5%). MS (ESI) m/z: 371 [M+H]+.

出典