Ammonia → 3-Chloro-4-(trifluoromethyl)benzylamine

A solution of 4-bromomethyl-2-chloro-1-trifluoromethylbenzene (3.0 g, 11 mmol) in DMF (25 ml) was added dropwise to a mixture of 25% aqueous ammonia (50 ml) and DMF (25 ml). The reaction mixture was stirred at room temperature for 60 hours. The solvent was removed in vacuo. The residue was dissolved in ethyl acetate (100 ml) and washed with a saturated aqueous solution of sodium hydrogen carbonate (100 ml). The aqueous phase was extracted with ethyl acetate (2×60 ml). The combined organic layers were dried over magnesium sulphate. The solvent was removed in vacuo. The crude product was purified by flash chromatography on silica (90 g), using first ethyl acetate/heptane (1:3) together with 3% triethylamine and subsequently DCM/methanol/25% aqueous ammonia as eluent, to give 250 mg of 3-chloro-4-(trifluoromethyl)benzylamine.

1. customThe solvent was removed in vacuo
2. dissolutionThe residue was dissolved in ethyl acetate (100 ml)
3. washwashed with a saturated aqueous solution of sodium hydrogen carbonate (100 ml)
4. extractionThe aqueous phase was extracted with ethyl acetate (2×60 ml)
5. dry with materialThe combined organic layers were dried over magnesium sulphate
6. customThe solvent was removed in vacuo
7. customThe crude product was purified by flash chromatography on silica (90 g)

ORD record

ord-3ba00673008840efbec664036e7d6321

Source dataset

uspto-grants-2002_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06437147B1