To carbonic acid tert-butyl ester 2,4-difluoro-3-formyl-phenyl ester (39, 0.405 g, 15.7 mmol) in methanol (36 mL), under an atmosphere of nitrogen, was added 5-pyridin-3-yl-1H-pyrrolo[2,3-b]pyridine (89, 288.0 mg, 14.8 mmol, prepared as in Example 17, Scheme 32) and potassium hydroxide (145.0 mg, 25.9 mol). The reaction was stirred at room temperature overnight. The reaction was poured into water and extracted with ethyl acetate. The organic layer was washed with brine, dried over anhydrous sodium sulfate and concentrated. The desired compound was isolated by silica gel column chromatography eluting with 4% methanol in methylene chloride to give a colorless oil (P-0009, 0.23 g, 44.1%). MS (ESI) [M+H+]+=354.1.
