反应详情

A solution of N-(4-chloro-2-propionylphenyl)trifluoromethanesulfonamide 22 (450 mg, 1.43 mmol), O-(4-chlorophenyl)hydroxylamine hydrochloride (257 mg, 1.43 mmol) and anhydrous NaOAc (125 mg, 1.52 mmol) in EtOH (23 mL) was stirred for 15 h at RT. The reaction mixture was concentrated under vacuum and the residue filtered through a pad of silica (eluting with CH2Cl2/PE, 3:2). The residue was purified by radial thin layer chromatography (eluting with CH2Cl2/PE, 1:5) to afford N-{4-chloro-2-[1-(4-chlorophenoxyimino)propyl]phenyl}trifluoromethanesulfonamide 128 (455 mg, 72%), as a yellow solid. M.p. 87-88° C. 1H n.m.r. (200 MHz, CDCl3) δ 11.18, br s, 1H, 7.71, d, J=8.8 Hz, 1H, 7.58, d, J=2.6 Hz, 1H, 7.41, dd, J=2.6 and 8.8 Hz, 1H, 7.35, d, J=8.8 Hz, 2H, 7.11, d, J=8.8 Hz, 2H, 3.02, q, J=7.6 Hz, 2H, 1.30, t, J=7.6 Hz, 3H.

1. concentrationThe reaction mixture was concentrated under vacuum
2. filtrationthe residue filtered through a pad of silica (eluting with CH2Cl2/PE, 3:2)
3. customThe residue was purified by radial thin layer chromatography (eluting with CH2Cl2/PE, 1:5)