Sodium Hydroxide → HCID 22561815, compound

Participants

Reaction Conditions

Reaction Steps

To a mixture of 4-bromoindole (6.2 g, 31.7 mmol), and 2,4-difluorophenylboronic acid (5 g, 31.7 mmol) in THF (108 mL) were added Palladium catalyst Pd(PPh3)4 (0.67 g, 0.95 mmol) and the freshly prepared sodium hydroxide solution (3.8 g, 95 mmol in 45 mL of water). The system was degassed and then charged with nitrogen. The degas procedure was repeated for three times. The mixture was stirred under nitrogen at 80° C. oil bath for over the weekend. TLC showed the completion of the coupling reaction. The mixture was cooled to room temperature, diluted with ethyl acetate, and separated from water layer. The ethyl acetate solution was washed with brine, and dried over Na2SO4. After filtration, the solvents were evaporated, and the crude product was purified by a silica gel column to give 6.55 g (90%) of 4-(2,4-difluoro-phenyl)-1H-indole.

Provenance & Evidence