反应详情

温度

0 °C

Add phosphorus oxychloride (1.1 eq.) with vigorous stirring to DMF (cooled in an ice bath). After the addition is complete, allow to stir in the ice bath for ˜10 minutes, then add a solution of 4-methoxy-1H-indole (5 g) in anhydrous DMF with vigorous stirring. Allow to stir at 0° C. After 1 hour, warm to room temperature. After 16 hours, carefully add 4 eq. of 2N NaOH with vigorous stirring. Heat to about 80° C. and then cool. Pour the reaction mixture into cold water with vigorous stirring to give a solid. Collect the solid by filtration and dry in a vacuum oven at room temperature to give the title compound. Acidify the filtrate and extract with EtOAc. Combine the organic layers and wash with 50% brine. Collect the organic layer, dry (MgSO4) filter, and remove the solvent to give the title compound as a light purple solid. Total yield of the title compound is 5.44 g: MS (ES+): m/z 175 (M+H)+, 160 (M−CH3)+; (ES−): m/z 174 (M−H)−.

1. additionAfter the addition
2. temperaturewarm to room temperature
3. waitAfter 16 hours
4. temperatureHeat to about 80° C.
5. temperaturecool
6. stirringwith vigorous stirring
7. customto give a solid
8. customCollect the solid
9. filtrationby filtration
10. customdry in a vacuum oven at room temperature