反应详情

A solution of N-(2-acetyl-5-trifluoromethylphenyl)trifluoromethanesulfonamide 35 (250 mg, 0.75 mmol), O-(4-chlorophenyl)hydroxylamine hydrochloride (148 mg, 0.82 mmol) and anhydrous NaOAc (67 mg, 0.82 mmol) in EtOH (15 mL) was stirred for 20 hours at RT. The reaction mixture was concentrated under vacuum, the residue filtered through a pad of silica (eluting with CH2Cl2) and the solvent removed under reduced pressure. The residue was purified by recrystallization from CH2Cl2/PE to afford N-{2-[1-(4-chlorophenoxyimino)ethyl]-5-trifluoromethylphenyl}trifluoromethanesulfonamide 199 (310 mg, 90%), as a pale yellow solid. M.p. 89-90° C. 1H n.m.r. (200 MHz, CDCl3) δ 11.41, br s, 1H, 8.02, s, 1H, 7.76, d, J=8.6 Hz, 1H, 7.56, m, 1H, 7.36, d, J=9.2 Hz, 2H, 7.12, d, J=9.2 Hz, 2H, 2.60, s, 3H.

1. concentrationThe reaction mixture was concentrated under vacuum
2. filtrationthe residue filtered through a pad of silica (eluting with CH2Cl2)
3. customthe solvent removed under reduced pressure
4. customThe residue was purified by recrystallization from CH2Cl2/PE