反应详情

According to the method of Example 59, 5-carboxy-3-(2,4-dichlorobenzoyl)-2-methylindole (0.500 g) is suspended in N,N-dimethylformamide (10 ml), to which is added N,N′-carbonyldiimidazole (0.350 g), and stirred at room temperature for 2 hours. Next, 1-butanesulfonamide (0.296 g) and diazabicycloundecene (0.328 g) are added thereto, and stirred under heat at 100° C. for 6 hours. The reaction mixture is concentrated under reduced pressure, and the residue is made acidic with water and 3 M HCl added thereto, and then extracted with ethyl acetate. The organic layer is washed with a saturated saline solution, and dried with anhydrous sodium sulfate. The drying agent is removed through filtration, and the filtrate is concentrated under reduced pressure. The resulting oily residue is purified through silica gel column chromatography (eluent: chloroform/methanol=10/1), and recrystallized from ethanol-hexane to obtain a colorless crystal of 5-(1-butanesulfonylcarbamoyl)-3-(2,4-dichlorobenzoyl)-2-methylindole (97) (0.420 g).

1. stirringstirred
2. temperatureunder heat at 100° C. for 6 hours
3. concentrationThe reaction mixture is concentrated under reduced pressure
4. additionadded
5. extractionextracted with ethyl acetate
6. washThe organic layer is washed with a saturated saline solution
7. dry with materialdried with anhydrous sodium sulfate
8. customThe drying agent is removed through filtration
9. concentrationthe filtrate is concentrated under reduced pressure
10. customThe resulting oily residue is purified through silica gel column chromatography (eluent: chloroform/methanol=10/1)
11. customrecrystallized from ethanol-hexane