反应详情

To a solution of N-[2-(benzylthio)-3,3-dimethoxypropyl]-5-hydroxy-7-nitro-1H-indole-2-carboxamide (1.0 g) in tetrahydrofuran (10 mL) were added dropwise triethylamine (0.38 mL) and pivaloyl chloride (0.30 mL) under ice-cooling. The mixture was stirred overnight at room temperature, diluted with ethyl acetate, washed with water, 1N hydrochloric acid and saturated brine, dried (MgSO4), and concentrated. The residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=1:1) to give the title compound (1.18 g, yield 99%) as a pale-yellow amorphous powder.

1. temperaturecooling
2. washwashed with water, 1N hydrochloric acid and saturated brine
3. dry with materialdried (MgSO4)
4. concentrationconcentrated
5. customThe residue was purified by basic silica gel column chromatography (hexane:ethyl acetate=1:1)