Ammonium Chloride → (R)-N-(4-(3-aminopiperidin-1-yl)-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide hydrochloride

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(R)-tert-Butyl 1-(5-bromo-3-(nicotinamido)-1H-pyrrolo[2,3-b]pyridin-4-yl)piperidin-3-ylcarbamate (125 mg, 0.243 mmol; Example 1A, Step A) was dissolved in dioxane (20 mL) and cooled to −78° C. MeLi (455 μL, 0.728 mmol) was slowly added, and the reaction was stirred for 10 minutes. n-Butyl lithium (146 μL, 0.364 mmol) was slowly added, and the reaction was stirred for 10 minutes at −78° C. Saturated ammonium chloride was then added, and the mixture was extracted several times with DCM. The layers were separated, dried, filtered, and concentrated. The residue was purified by reverse phase chromatography (Biotage Horizon, C-18 25M+, 0-80% CH3CN/water+10 mM ammonium acetate and 1% IPA). The product was dissolved in TFA (2 mL), stirred for 30 minutes, concentrated and purified by reverse phase chromatography (Biotage Horizon, C-18 12M+, 0-30% CH3CN/water+0.1% TFA). The product was redissolved in 10% MeOH in DCM (2 mL) and added dropwise to a stirred solution of 2M HCl in ether. The reaction was concentrated to give (R)—N-(4-(3-aminopiperidin-1-yl)-1H-pyrrolo[2,3-b]pyridin-3-yl)nicotinamide hydrochloride (18.5 mg, 17% yield). 1H NMR (400 MHz, D2O) δ 9.10 (s, 1H), 8.78 (d, 1H), 8.62 (dt, 1H), 7.94 (d, 1H), 7.85 (dd, 1H), 7.39 (s, 1H), 6.78 (d, 1H), 3.89 (d, 1H), 3.72 (d, 1H), 3.33 (m, 1H), 3.21-3.09 (m, 2H), 1.93 (m, 1H), 1.58 (m, 1H), 1.47 (m, 1H), 1.36 (m, 1H). LCMS (APCI+) m/z 337.1 (M+H)+, Retention time=0.43 minutes (Method 3).

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