反应详情

With cooling on ice, an anhydrous N,N-dimethylformamide (DMF) solution (70 ml) of 1H-indole-2-carboxylic acid ethyl ester (45 g, 0.238 mol) was added dropwise to a solution of 50% sodium hydride (13.7 g, 0.286 mol) in anhydrous N,N-dimethylformamide (DMF) (90 ml). After one and half hour of stirring with cooling on ice, the reaction mixture was warmed to room temperature, and then stirred for one hour. After cooling on ice, an anhydrous N,N-dimethylformamide (DMF) solution of benzenesulfonyl chloride (50.4 g) was added dropwise, and the resulting mixture was stirred for one hour. An aqueous solution of 0.5 N hydrochloric acid was added dropwise to the reaction mixture, and then water was added thereto. The mixture was stirred for 30 minutes. The resulting solid was collected by filtration, and washed with water and then with n-hexane. The solid was dissolved in ethyl acetate, and washed with a saturated aqueous solution of sodium bicarbonate and then with a saturated aqueous solution of sodium chloride. The organic layer was dried over anhydrous sodium sulfate. The desiccant was removed by filtration. The filtrate was concentrated under reduced pressure to give crude 1-benzenesulfonyl-1H-indole-2-carboxylic acid ethyl ester. The obtained crude product was recrystallized (ethyl acetate/hexane) to give 1-benzenesulfonyl-1H-indole-2-carboxylic acid ethyl ester (68.9 g, 79%).

1. temperatureWith cooling on ice
2. temperaturewith cooling on ice
3. stirringstirred for one hour
4. temperatureAfter cooling on ice
5. stirringthe resulting mixture was stirred for one hour
6. stirringThe mixture was stirred for 30 minutes
7. filtrationThe resulting solid was collected by filtration
8. washwashed with water
9. dissolutionThe solid was dissolved in ethyl acetate
10. washwashed with a saturated aqueous solution of sodium bicarbonate
11. dry with materialThe organic layer was dried over anhydrous sodium sulfate
12. customThe desiccant was removed by filtration
13. concentrationThe filtrate was concentrated under reduced pressure
14. customto give crude 1-benzenesulfonyl-1H-indole-2-carboxylic acid ethyl ester
15. customThe obtained crude product
16. customwas recrystallized (ethyl acetate/hexane)