To a solution of 3-Iodo-1-triisopropylsilanyl-1H-pyrrolo[2,3-b]pyridine (96, 0.644 g, 1.61 mmol) in tetrahydrofuran (10.0 mL) at −40° C. under nitrogen, isopropylmagnesium chloride (2.0 M in tetrahydrofuran, 0.80 mL) was added slowly. The reaction was allowed to warm to 15° C. over 100 minutes, then cooled to −40° C., followed by adding [2,6-difluoro-3-(propane-1-sulfonylamino)-benzyl]-(5-formyl-pyridin-2-yl)-carbamic acid tert-butyl ester (560, 0.100 g, 0.21 mmol, prepared as described in Example 60, Scheme 175) in tetrahydrofuran (2.0 mL). The reaction was allowed to warm to 5° C. over 2 hours, then poured into aqueous ammonium chloride, and extracted with ethyl acetate. The organic layer was dried over anhydrous sodium sulfate, and filtered. The filtrate was concentrated and purified by silica gel column chromatography eluting with 20% to 100% ethyl acetate in hexane to give a yellow solid (574, 75 mg, 47%). MS (ESI) [M+H+]+=744.7.
