反応 #47515

反応方程式

(E)-4-bromo-3-(2,5-dichloro-phenoxy)-but-2-enoic acid ethyl ester

(S)-2-amino-3-cyclohexyl-propionic acid methyl ester

N,N-diisopropylethylamine

→

(S)-3-cyclohexyl-2-[4-(2,5-dichloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-propionic acid methyl ester

収率 15.2%

溶媒

N,N-dimethylformamide

反応条件

後処理

1. 1
   温度the reaction mixture was heated at 110° C.-120° C. for 16 h
2. 2
   抽出the resulting mixture was extracted with ethyl acetate
3. 3
   洗浄The combined organic layers were washed with a saturated aqueous sodium chloride solution
4. 4
   乾燥dried over sodium sulfate
5. 5
   濃縮concentrated in vacuo
6. 6
   その他Purification by flash column chromatography (silica gel (100-200 mesh))

実験手順

To a stirred solution of (S)-2-amino-3-cyclohexyl-propionic acid methyl ester (750 mg, 0.004 mol) in N,N-dimethylformamide (10 mL) was added N,N-diisopropylethylamine (2.6 g, 0.02 mol) slowly at room temperature, under nitrogen. The resulting mixture was stirred for 5 min and then treated with (E)-4-bromo-3-(2,5-dichloro-phenoxy)-but-2-enoic acid ethyl ester (1.5 g, 0.004 mol) and the reaction mixture was heated at 110° C.-120° C. for 16 h. After this time, ice water was added and the resulting mixture was extracted with ethyl acetate. The combined organic layers were washed with a saturated aqueous sodium chloride solution, dried over sodium sulfate and concentrated in vacuo. Purification by flash column chromatography (silica gel (100-200 mesh)) afforded (S)-3-cyclohexyl-2-[4-(2,5-dichloro-phenoxy)-2-oxo-2,5-dihydro-pyrrol-1-yl]-propionic acid methyl ester (250 mg, 15%) as yellow oil.

出典