反应详情

A solution of 2-{4-[(2-tert-butoxy-1-methylethoxy)methyl]phenyl}-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (248 mg) in trifluoroacetic acid (1 ml) was left to stand for 30 minutes. Saturated ammonium chloride solution (20 ml) was added and the mixture was extracted with ethyl acetate (2×20 ml). The extracts were dried (MgSO4) and concentrated and the residue was dissolved in dichloromethane (10 ml). The solution was washed with water (2×10 ml) and dried (MgSO4). Volatile material was removed by evaporation and the residue was purified by flash chromatography, eluting with methanol/ethyl acetate (1:24 v/v), to give 2-[4-([2-hydroxy-1-methyl)ethoxy]methyl) phenyl]-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (82 mg), 1H NMR (d6 -DMSO): 1.15 (s, 3 H), 2.25 (s, 3 H), 3.3-3.7 (s, 3 H), 3.8 (s, 3 H), 4.6 (s, 2 H), 7.3-7.55 (m, 5 H), 7.6 (dd, 1 H), 8.45 (dd, 1 H), 8.8 (dd, 1 H), 10.35-10.45 (br s, 1 H); mass spectrum (+ve ESP): 445 (M+H)+.

1. extractionthe mixture was extracted with ethyl acetate (2×20 ml)
2. dry with materialThe extracts were dried (MgSO4)
3. concentrationconcentrated
4. dissolutionthe residue was dissolved in dichloromethane (10 ml)
5. washThe solution was washed with water (2×10 ml)
6. dry with materialdried (MgSO4)
7. customVolatile material was removed by evaporation
8. customthe residue was purified by flash chromatography
9. washeluting with methanol/ethyl acetate (1:24 v/v)