Hydroxyamine hydrochloride → (3-Fluoro-5-(trifluoromethyl)phenyl)(4-fluorophenyl)methanone oxime

Temperature

100 °C

To a solution of (3-fluoro-5-(trifluoromethyl)phenyl)(4-fluorophenyl)methanone, prepared as described in Procedure 4, (860 mg, 3.0 mmol) in pyridine (6 mL) was added hydroxylamine hydrochloride (830 mg, 12.0 mmol) and the reaction mixture was heated at 100° C. for 2 h. The reaction mixture was concentrated under reduced pressure and the residue was dissolved in EtOAc (50 mL), washed with 1 N HCl (2×20 mL), water (20 mL) and sat. NaCl (20 mL), then dried over MgSO4, filtered and concentrated under reduced pressure to yield (3-fluoro-5-(trifluoromethyl)phenyl)(4-fluorophenyl)methanone oxime (912 mg, 100% yield) as a white solid. TLC (30% EtOAc/hexane) shows two spots, the cis and trans isomers of (3-fluoro-5-(trifluoromethyl)phenyl)(4-fluorophenyl)methanone oxime, that were not separated. LCMS: RT=1.59 min [M+H] 302.1 (2 min Phenomenex Luna C18 column, 4.6×30 mm eluting with 10-90% acetonitrile/H2O over 2 minutes containing 0.1% TFA; 5 mL/min, monitoring at 220 nm).

1. concentrationThe reaction mixture was concentrated under reduced pressure
2. dissolutionthe residue was dissolved in EtOAc (50 mL)
3. washwashed with 1 N HCl (2×20 mL), water (20 mL) and sat. NaCl (20 mL)
4. dry with materialdried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated under reduced pressure

ORD record

ord-0ff63989a064400691fcfb344c90bb31

Source dataset

uspto-grants-2010_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07790770B2