反応 #1869167

反応方程式

propionaldehyde

2-(2,5-dimethylpyrrol-1-yl)-5-oxiranylpyridine

(S)-(+)-2-amino-1-propanol

acetic acid

Sodium triacetoxyborohydride

→

(2S)-2-[{(RS)-2-[6-(2,5-dimethyl-1H-pyrrol-1-yl)pyridin-3-yl]-2-hydroxyethyl}propylamino]propan-1-ol

収率 89.0%

溶媒

water

DCM

toluene

反応条件

後処理

1. 1
   温度was heated
2. 2
   温度to reflux overnight
3. 3
   その他to separate
4. 4
   温度dropwise maintaining the temperature below 30° C
5. 5
   その他before quenching with water (1.20 L)
6. 6
   その他to separate
7. 7
   抽出The aqueous phase was extracted with DCM (1.20 L)
8. 8
   洗浄the combined organic phases washed with water (0.60 L), water (0.30 L)
9. 9
   濃縮concentrated in vacuo
10. 10
    その他Yield 89% (0.89 Kg, the material was isolated in approximately 70% purity) δH (CDCl3, 300 MHz) 0.8-1.0 (6H, m), 1.50-1.70 (2H, m), 2.10 (6H, s), 2.50-3.15 (5H, m), 3.50 (2H, dd), 4.80 (1H, dd), 5.90 (2H, s), 7.20 (1H, m), 7.80-7.90 (1H, m), 8.60 (1H, m) ppm

実験手順

A mixture of 2-(2,5-dimethylpyrrol-1-yl)-5-oxiranylpyridine (0.65 Kg, 3.04 mol), (S)-(+)-2-amino-1-propanol (0.30 Kg, 3.95 mol) in toluene (6.50 L) was heated to reflux overnight. The reaction mixture was cooled to room temperature and DCM (6.5 L) and water (1.30 L) were added and the phases allowed to separate. Sodium triacetoxyborohydride (0.96 Kg, 4.56 mol) was added to the organic layer, followed by propionaldehyde (0.48 L, 6.68 mol) and glacial acetic acid (0.17 L, 3.04 mol) dropwise maintaining the temperature below 30° C. The reaction mixture was stirred at room temperature for 1 hour before quenching with water (1.20 L) and an aqueous solution of potassium carbonate (1.00 Kg in 3.23 Kg water) and the phases were allowed to separate. The aqueous phase was extracted with DCM (1.20 L) and the combined organic phases washed with water (0.60 L), water (0.30 L) and concentrated in vacuo. Yield 89% (0.89 Kg, the material was isolated in approximately 70% purity) δH (CDCl3, 300 MHz) 0.8-1.0 (6H, m), 1.50-1.70 (2H, m), 2.10 (6H, s), 2.50-3.15 (5H, m), 3.50 (2H, dd), 4.80 (1H, dd), 5.90 (2H, s), 7.20 (1H, m), 7.80-7.90 (1H, m), 8.60 (1H, m) ppm. MS m/z 332 (MH+). The intermediate amine was characterised as δH (CDCl3, 300 MHz) 1.10 (3H, t), 2.10 (6H, s), 2.7-3.2 (3H, m), 3.45 (1H, m), 3.70 (H, dd), 4.85 (1H, m), 5.90 (2H, s), 7.20 (1H, d), 7.90 (1H, dd), 8.60 (1H, d) ppm. MS m/z 290 (MH+).

出典