反応 #657293

反応方程式

sodium carbonate

3-(3,4′-dichloro-5-methyl-biphenyl-4-yl)-4-hydroxy-8-methoxy-1-methyl-1,8-diaza-spiro[4.5]dec-3-en-2-one

sodium hydrogen carbonate

sulfuryl chloride

→

3-Chloro-3-(3,4′-dichloro-5-methyl-biphenyl-4-yl)-8-methoxy-1-methyl-1,8-diaza-spiro[4.5]decane-2,4-dione

溶媒

dichloromethane

dichloromethane

反応条件

後処理

1. 1
   その他the layers were separated
2. 2
   抽出the water phase extracted with ethyl acetate (3×20 ml)
3. 3
   洗浄the combined organic phases washed with saturated aqueous sodium carbonate and brine
4. 4
   乾燥dried over sodium sulfate
5. 5
   濃縮concentrated
6. 6
   その他The residue was purified by chromatography on silica gel (ethyl acetate/cyclohexane 2:1)

実験手順

To a solution of 3-(3,4′-dichloro-5-methyl-biphenyl-4-yl)-4-hydroxy-8-methoxy-1-methyl-1,8-diaza-spiro[4.5]dec-3-en-2-one (100 mg, 0.224 mmol) and sodium hydrogen carbonate (47 mg, 0.560 mmol) in dichloromethane (5 ml) at −5° C. was added sulfuryl chloride (0.017 ml, 28.3 mg, 0.210 mmol) in dichloromethane (0.5 ml) dropwise. The reaction mixture was stirred at 0° C. for 30 minutes and at room temperature overnight, poured on saturated aqueous sodium carbonate, the layers were separated, the water phase extracted with ethyl acetate (3×20 ml), the combined organic phases washed with saturated aqueous sodium carbonate and brine, dried over sodium sulfate and concentrated. The residue was purified by chromatography on silica gel (ethyl acetate/cyclohexane 2:1). Yield: 65 mg of 3-chloro-3-(3,4′-dichloro-5-methyl-biphenyl-4-yl)-8-methoxy-1-methyl-1,8-diaza-spiro[4.5]decane-2,4-dione (title compound P1.9) as a gum.

出典