反应详情

A solution of 5.3 g of 3-(4-chlorophenyl)-6-hydroxy-1,2-benzisoxazole in 30 ml of dimethylformamide is added dropwise to a suspension of 0.65 g of sodium hydride (50% suspension in oil) in 30 ml of dimethylformamide. After stirring for 20 min, 1.4 ml of ethyl bromoacetate is added. The reaction mixture is stirred for 1 hr, poured into water and the precipitate is collected. The precipitate is added to 30 ml of 15% sodium hydroxide solution and 30 ml methanol and heated at reflux for 3 hr. The mixture is poured into water, acidified and filtered. Recrystallization from toluene and acetonitrile gives {[3-(4-chlorophenyl)-1,2-benzisoxazol-6-yl]oxy}-acetic acid, mp 207° C.

1. stirringThe reaction mixture is stirred for 1 hr
2. customthe precipitate is collected
3. additionThe precipitate is added to 30 ml of 15% sodium hydroxide solution and 30 ml methanol
4. temperatureheated
5. temperatureat reflux for 3 hr
6. additionThe mixture is poured into water
7. filtrationfiltered
8. customRecrystallization from toluene and acetonitrile