Propane-1-sulfonic acid {2,4-difluoro-3-[5-(4,4,5,5-tetramethyl-[1,3,2]dioxaborolan-2-yl)-1H-pyrrolo[2,3-b]pyridine-3-carbonyl]-phenyl}-amide (30, 2.1 g, 4.16 mmol), 21 mL of toluene, diisopropylamine (1.5 mL, 8.31 mmol), 4-dimethylaminopyridine (101 mg, 0.83 mmol) and 2,6-dichloro-benzoyl chloride (10, 0.7 mL, 4.78 mmol) are combined in a reaction flask under nitrogen. The reaction is stirred at room temperature for 17 hours, then diluted with 100 mL of ethyl acetate and extracted. The organic layer is washed sequentially with 40 mL of saturated aqueous sodium bicarbonate, 40 mL of water, and 40 mL of brine, then dried with sodium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material is purified by silica gel column chromatography, eluting with a gradient of ethyl acetate and hexane. Appropriate fractions are combined and concentrated under vacuum and the resulting material is triturated with diethyl ether to provide the desired compound.
