反应详情

Add methenamine (1.10 equiv; 231.55 mmoles; 32.46 g) to a solution of 4-fluoro-3-(trifluoromethyl)phenacyl bromide (60.00 g 1.00 equiv; 210.50 mmoles) in ethyl acetate (450 mL; 4.60 moles). Stir the mixture at room temperature overnight. Remove the solvent in vacuo and triturate the solid in MTBE. Filter and dry under reduced pressure. Add ethanol (450 mL; 7.73 moles), followed by hydrogen chloride (150 mL; 8.30 equiv; 1.75 moles) and stir the mixture at room temperature overnight. Remove the solvent in vacuo and dry the solid in vacuo at 50° C. for a week to obtain 2-Amino-1-(4-fluoro-3-trifluoromethyl-phenyl)-ethanone hydrochloride (54.23 g; 100% yield) as a white solid.

1. customRemove the solvent in vacuo
2. customtriturate the solid in MTBE
3. filtrationFilter
4. customdry under reduced pressure
5. stirringstir the mixture at room temperature overnight
6. customRemove the solvent in vacuo
7. customdry the solid in vacuo at 50° C. for a week