Ammonium Chloride → 4-bromo-6,7-difluoro-1H-indole

Participants

Reaction Conditions

Reaction Steps

A solution (20 mL) of 5-Bromo-1,2-difluoro-3-nitrobenzene (1.19 g, 5.00 mmol) in THF was cooled to −50° C. To this, a 1 M vinylmagnesium bromide/THF solution (15 mL) was added dropwise. After the mixture was stirred at −40° C. for 4 hours, a saturated aqueous ammonium chloride solution was added thereto, and concentrated under reduced pressure. The reaction solution was diluted with ethyl acetate, and after washed with saturated brine, the resultant was dried over anhydrous magnesium sulfate. The resultant was concentrated under reduced pressure. The resulting residue was purified by silica gel chromatography (hexane) to thus obtain the title compound.

Provenance & Evidence