反应详情

To a solution of 6-trifluoromethoxyindole (2.68 g, 13.3 mmol) in dry DMF (10 mL) at 0° C., is added chlorosulfonylisocyanate (2.35 g, 1.44 mL, 16.6 mmol). The mixture is then brought to room temperature slowly and stirred for 1 h. The mixture is poured into ice (100 mL) and stirred for 1 h. The precipitate is collected by filtration and washed thoroughly with water and dried in vacuo, which is then dissolved in DMF (15 mL). To the solution is added K2CO3 and EtI (2.59 g, 1.34 mL, 16.6 mmol), and the mixture is stirred at 50° C. overnight. It is then poured into ice-water (200 mL). The precipitate is collected by filtration and washed with water, dried in air and purified by chromatography (silica gel, DCM) to furnish 1-ethyl-6-trifluoromethoxyindole-3-carbonitrile (2.90 g, 86%).

1. customis then brought to room temperature
2. stirringstirred for 1 h
3. filtrationThe precipitate is collected by filtration
4. washwashed thoroughly with water
5. customdried in vacuo, which
6. dissolutionis then dissolved in DMF (15 mL)
7. stirringthe mixture is stirred at 50° C. overnight
8. filtrationThe precipitate is collected by filtration
9. washwashed with water
10. customdried in air
11. custompurified by chromatography (silica gel, DCM)