反应详情

3-Hydroxybenzotrifluoride was added to a solution of potassium hydroxide in isopropanol. N-acetylaminoethyl 2-bromo-2-(4-chlorophenyl)acetate in isopropanol was added to the isopropanol/phenoxide solution and stirred at room temperature for 4 hours. The isopropanol was removed by vacuum distillation, and the resulting slush was dissolved in ethyl acetate and washed twice with water and once with brine. After drying over magnesium sulfate and filtration, the solvent was removed to give crude product as an oil. The crude product was dissolved in hot toluene/hexanes (1:1 v/v) and cooled to between 0 and 10° C. to crystallize the product. The filter cake was washed with hexanes/toluene (1:1 v/v) and then dried under vacuum at 50° C. The isolated solid was dissolved in hot 1:6 (v/v) isopropanol in hexanes. After cooling, the pure racemic 2-Acetamidoethyl 4-Chlorophenyl-(3-trifluoro methylphenoxy)-acetate formed as a crystalline solid. The solid was collected by filtration, the filter cake washed with 1:6 (v/v) isopropanol in hexanes and dried under vacuum at 50° C.

1. customThe isopropanol was removed by vacuum distillation
2. dissolutionthe resulting slush was dissolved in ethyl acetate
3. washwashed twice with water and once with brine
4. dry with materialAfter drying over magnesium sulfate and filtration
5. customthe solvent was removed
6. customto give crude product as an oil
7. temperaturecooled to between 0 and 10° C.
8. customto crystallize the product
9. washThe filter cake was washed with hexanes/toluene (1:1 v/v)
10. customdried under vacuum at 50° C
11. dissolutionThe isolated solid was dissolved in hot 1:6 (v/v) isopropanol in hexanes
12. temperatureAfter cooling