反应详情

1-(4-bromo-1-methyl-1H-pyrrol-2-yl)-2,2,2-trifluoroethanone (5.0 g, 19.5 mmol) was dissolved in ammonium hydroxide (72.5 ml, 29.4% aqueous solution) and stirred at room temperature for 45 min. The solution was brought to pH=7 with 2N HCl. The solid precipitate was collected by filtration. The solid was washed with water and dried overnight under reduced pressure at 50° C. The aqueous layer was extracted twice with dichloromethane. The organic phase was concentrated in vacuo to afford more solid. Solid from the filtration and extraction were combined to afford 4-bromo-1-methyl-1H-pyrrole-2-carboxylic acid amide (3.2 g, 81%) as a white solid: LC/MS-ESI observed [M+H]+ 203 and 205.

1. filtrationThe solid precipitate was collected by filtration
2. washThe solid was washed with water
3. customdried overnight under reduced pressure at 50° C
4. extractionThe aqueous layer was extracted twice with dichloromethane
5. concentrationThe organic phase was concentrated in vacuo
6. customto afford more solid
7. filtrationSolid from the filtration and extraction