反应详情

温度

21 °C

Magnesium turnings (40 g, 1.65 mol) are introduced into diethyl ether (100 ml) and, while stirring, a solution of 2-bromoanisole (206 ml, 1.65 mol) in diethyl ether (450 ml) is added dropwise. The reaction can be initiated, if necessary, by adding iodine crystals. During the addition, the reaction mixture should boil gently. After the addition, the mixture was stirred at room temperature for 1 hour. A slurry of 5-chloroisatin (75 g, 0.41 mol) in THF (750 ml) was added to the Grignard solution while cooling slightly (temperature 18-24° C.), and the mixture was stirred at room temperature for 30 min. The reaction mixture was stirred into ammonium chloride solution and extracted several times with ethyl acetate. The combined organic phase was washed four times with water, dried over magnesium sulfate and concentrated under reduced pressure. The remaining residue was stirred with 2-propanol. The resulting precipitate was filtered off, washed with 2-propanol and diethyl ether and dried. 106 g of the desired intermediate were obtained.

1. customThe reaction
2. additionDuring the addition
3. additionAfter the addition
4. stirringthe mixture was stirred at room temperature for 1 hour
5. stirringthe mixture was stirred at room temperature for 30 min
6. extractionextracted several times with ethyl acetate
7. washThe combined organic phase was washed four times with water
8. dry with materialdried over magnesium sulfate
9. concentrationconcentrated under reduced pressure
10. stirringThe remaining residue was stirred with 2-propanol
11. filtrationThe resulting precipitate was filtered off
12. washwashed with 2-propanol and diethyl ether
13. customdried