反应详情

温度

-60 °C

230 ml of a 2M solution of NaHMDS in THF are introduced into 250 ml of THF under nitrogen. The solution is cooled to −60° C. and then 30.5 g of (4-methoxyphenyl)acetic acid in 120 ml of THF are added at this temperature. After 1 h 30 min at −60° C., 33 g of methyl 2-chloro-4-fluorobenzoate are added and the mixture is stirred at −60° C. for 45 min and then allowed to return to 0° C. The reaction medium is poured onto 500 ml of ice-cold 2N HCl and extracted with ether and the extract is washed with water and then with a saturated aqueous sodium chloride solution. After drying, concentrating to dryness and then crystallizing from pentane, 27.4 g of the expected compound are obtained.

1. customto return to 0° C
2. extractionextracted with ether
3. washthe extract is washed with water
4. customAfter drying
5. concentrationconcentrating to dryness
6. customcrystallizing from pentane, 27.4 g of the expected compound
7. customare obtained