C([N:5]1[C:9]2=[N:10][CH:11]=[CH:12][C:13]([C:14]([F:17])([F:16])[F:15])=[C:8]2[C:7](C#N)=[CH:6]1)(C)(C)C.[OH-].[Na+].C(=O)(O)[O-].[Na+]>S(=O)(=O)(O)O>[F:16][C:14]([F:15])([F:17])[C:13]1[CH:12]=[CH:11][N:10]=[C:9]2[NH:5][CH:6]=[CH:7][C:8]=121-tert-Butyl-4-trifluoromethyl-1H-pyrrolo[2,3-b]pyridine-3-carbonitrile (25, 1.071 g, 4.007 mmol) is dissolved in 10 mL of aqueous 60% sulfuric acid and stirred at 120° C. for 20 hours. The reaction is adjusted to pH ˜7 with sodium hydroxide and aqueous saturated sodium bicarbonate, then extracted with ethyl acetate. The organic layer is washed with water, then brine and dried with magnesium sulfate, filtered and the filtrate concentrated under vacuum. The resulting material is purified by silica gel column chromatography, eluting with ethyl acetate and hexane. Appropriate fractions are combined and concentrated under vacuum to provide the desired compound (26, 373 mg). MS (ESI) [M+H+]+=187.1.
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