反应详情

温度

-5 °C

2-(Trimethylsilyl)ethoxymethyl chloride (0.22 ml) was added dropwise over 5 minutes to a stirred solution of 4-chloro-N-(3-methoxy-5-methylpyrazin-2-yl)pyridine-3-sulphonamide (0.306 g) and N,N-diisopropylethylaminc (0.21 ml) in dry DMF (1 ml) at -15° C. The resultant solution was allowed to warm to -5° C. over 40 minutes then ethyl acetate (30 ml) was added and the mixture was washed with 2M hydrochloric acid (30 ml), water (30 ml) and saturated sodium chloride solution and then dried (MgSO4). Volatile material was removed by evaporation and the residue was purified by gradient elution with 30-50% ethyl acetate/hexane through a silica gel Mega Bond Elut column to give 4-chloro-N-(3-methoxy-5-methylpyrazin-2-yl)-N-[2-(trimethylsilyl)ethoxymethyl]pyridine-3-sulphonamide (0.266 g) as an oil; 1H NMR (d6 -DMSO): -0.1 (s, 9 H), 0.7 (t, 2 H), 2.45 (s, 3 H), 3.6 (t, 2 H), 3.85 (s, 3 H), 5.2 (s, 2 H), 7.8 (d, 1 H), 8.0 (s, 1 H), 8.8 (d, 1 H), 9.1 (s, 1 H); mass spectrum (+ve FAB, DMSO/Glycerol): 445 (M+H)+.

1. washthe mixture was washed with 2M hydrochloric acid (30 ml), water (30 ml) and saturated sodium chloride solution
2. dry with materialdried (MgSO4)
3. customVolatile material was removed by evaporation
4. customthe residue was purified by gradient elution with 30-50% ethyl acetate/hexane through a silica gel Mega Bond Elut column