4-Toluenesulfonyl chloride → 4-Bromo-1-(4-methylbenzene-1-sulfonyl)-1H-pyrrolo[2,3-b]pyridine

Participants

Reaction Conditions

Reaction Steps

To a suspension of 4-bromo-1H-pyrrolo[2,3-b]pyridine (15 g, 76 mmol) and p-toluenesulfonyl chloride (21.77 g, 114 mmol) in toluene (200 mL) was added a solution of tetrabutylammonium hydrogen sulfate (2.58 g, 7.61 mmol) in water (10 mL) and the mixture was cooled to 0° C. A solution of sodium hydroxide (9.13 g, 228 mmol) in water (30 mL) was added and the mixture was stirred at room temperature for 16 hours. The mixture was diluted with ethyl acetate and the solution was washed with saturated sodium chloride solution. The organic layer was dried over sodium sulfate, filtered and concentrated to give the title compound.

Provenance & Evidence