反应详情

A solution of N-(4-chloro-2-isobutyrylphenyl)trifluoromethanesulfonamide 31B (244 mg, 1.11 mmol), O-(4-Chlorophenyl)hydroxylamine hydrochloride (200 mg, 0.91 mmol) and anhydrous NaOAc (91 mg, 1.11 mmol) in EtOH (10 mL) was stirred for 48 h at RT. The reaction mixture was concentrated under vacuum, and the residue purified by column chromatography (eluting with CH2Cl2/PE, 3:7) to afford N-{4-chloro-2-[1-(4-chlorophenoxyimino)-2-methylpropyl]phenyl}trifluoromethanesulfonamide 215 (80 mg, 24%), as an orange oil. 1H n.m.r. (200 MHz, CDCl3) δ 7.56, d, J=8.8 Hz, 1H; 7.45, dd, J=2.4 and 8.8 Hz, 1H, 7.27, d, J==90 Hz, 2H, 7.23, d, J=2.4 Hz, 1H, 7.07, d, J=9.0 Hz, 2H, 2.94, m, 1H, 1.37, s, 3H, 1.19, s, 3H.

1. concentrationThe reaction mixture was concentrated under vacuum
2. customthe residue purified by column chromatography (eluting with CH2Cl2/PE, 3:7)