反应详情

A solution of 2-(2,4-dichloro-benzenesulfonylamino)-5-[4-(piperidine-1-sulfonyl)-phenylsulfanyl]-isonicotinic acid (173 mg, 0.29 mmol), N,O-dimethylhydroxylamine hydrochloride (84 mg, 0.86 mmol), TBTU (276 mg, 0.86 mmol) and DIPEA (0.18 ml, 1 mmol) in DMF (10 ml) was stirred at room temperature overnight under nitrogen. The reaction was diluted with ethyl acetate (25 ml), washed with brine (3×25 ml), dried (MgSO4) and concentrated under reduced pressure. The residue was purified by flash column chromatography using methanol 1/9 chloroform as eluent to afford 2-(2,4-dichloro-benzenesulfonylamino)-N-methoxy-N-methyl-5-[4-(piperidine-1-sulfonyl)-phenylsulfanyl]-isonicotinamide as a yellow oil (153 mg, 82%). 1H NMR (CDCl3): 8.40 (1 H, s, Ar); 8.07 (1 H, d, Ar); 7.53 (2 H, d, Ar); 7.46 (1 H, s, py); 7.34 (1 H, d, Ar); 7.22 (3 H, m, py and Ar); 3.34 (3 H, s, CH3O); 3.24 (3 H, s, CH3N); 2.88 (4 H, m, 2×CH2N pip); 1.55 (4 H, m, 2×CH2 pip); 1.33 (2 H, m, CH2 pip).

1. washwashed with brine (3×25 ml)
2. dry with materialdried (MgSO4)
3. concentrationconcentrated under reduced pressure
4. customThe residue was purified by flash column chromatography