反应详情

To a solution of 5-methoxyindole-2-carboxylic acid (5 g, 26 mmol) in N,N-dimethylformamide were added N,O-dimethylhydroxyamine hydrochloride (3.04 g, 31.2 mmol) and WSC (5.98 g, 31.2 mmol), 1-hydroxybenzotriazole (4.21 g, 31.2 mmol) and triethylamine (7.24 ml, 52 mmol), and the mixture was stirred for 6 hours. To this reaction solution were added ethyl acetate and 10% (Wt) citric acid, and the organic layer was extracted. The aqueous layer was extracted twice with ethyl acetate, and combined with the organic layer. The mixture was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated saline. The organic layer was separated, and dried over anhydrous sodium sulfate, filtered, and the solvent was evaporated under reduced pressure. The residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1) to give the title compound (4.5 g, 70%).

1. extractionthe organic layer was extracted
2. extractionThe aqueous layer was extracted twice with ethyl acetate
3. washThe mixture was washed with a saturated aqueous sodium hydrogen carbonate solution and saturated saline
4. customThe organic layer was separated
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered
7. customthe solvent was evaporated under reduced pressure
8. customThe residue was purified by silica gel column chromatography (hexane:ethyl acetate=4:1)