反应详情

To a mixture of the resulting 1-benzenesulfonyl-5-methanesulfonylindole-2-carboxylic acid methyl ester (3.5 g), tetrahydrofuran (45 ml) and methanol (12 ml), potassium hydroxide (0.79 g) was added at 0° C. and the mixture was stirred at the same temperature for 3 hours. 2N hydrochloric acid was added, and the mixture was extracted with dichloromethane. The organic layer was washed with water and dried over sodium sulfate. The solvent was distilled off under reduced pressure to obtain 2.2 g of a white amorphous 5-methanesulfonylindole-2-carboxylic acid methyl ester as a crude product.

1. additionwas added at 0° C.
2. extractionthe mixture was extracted with dichloromethane
3. washThe organic layer was washed with water
4. dry with materialdried over sodium sulfate
5. distillationThe solvent was distilled off under reduced pressure