反应详情

温度

60 °C

To a solution of 6-chloro-7-nitro-1H-indole-2,3-dione (2.0 g, 8.83 mmol) in methanol (20 mL) was added a solution of sodium methoxide in methanol (28%, 3.8 mL) at room temperature. The mixture was stirred at 60° C. for 14 hr. 1N Hydrogen chloride (10 mL) was added to the reaction mixture at 0° C. and the mixture was extracted with ethyl acetate. The organic layer was washed with brine (×3), dried over anhydrous magnesium sulfate, and concentrated in vacuo. The residue was purified by flash column chromatography on silica gel eluting with a 30-100% ethyl acetate/n-hexane gradient mixture to give the title compound (1.349 g, 6.07 mmol, 69%) as a yellow solid.

1. extractionthe mixture was extracted with ethyl acetate
2. washThe organic layer was washed with brine (×3)
3. dry with materialdried over anhydrous magnesium sulfate
4. concentrationconcentrated in vacuo
5. customThe residue was purified by flash column chromatography on silica gel eluting with a 30-100% ethyl acetate/n-hexane gradient mixture