(3R)-3-Aminopiperidine, 3-BOC protected → (R)-tert-butyl 1-(5-bromo-3-(pyrimidine-2-carboxamido)-1H-pyrrolo[2,3-b]pyridin-4-yl)piperidin-3-ylcarbamate

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A solution of N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)pyrimidine-2-carboxamide (110 mg, 0.328 mmol) in n-BuOH (5 mL) was treated with (R)-tert-butyl piperidin-3-ylcarbamate (197 mg, 0.982 mmol) and stirred at 160° C. for 48 hours in a sealed tube. The mixture was concentrated in vacuo, and the residue was diluted with water (25 mL) and extracted with EtOAc (3×20 mL). The combined organic extracts were dried over anhydrous magnesium sulfate and filtered. The filtrate was concentrated in vacuo, and the residue purified by C-18 reverse phase flash chromatography (Biotage SP4 unit, C-18 25M column, 5-85% CH3CN/water gradient; 25 CV) to provide (R)-tert-butyl 1-(5-bromo-3-(pyrimidine-2-carboxamido)-1H-pyrrolo[2,3-b]pyridin-4-yl)piperidin-3-ylcarbamate (67.6 mg, 40% yield) as a solid. LCMS (APCI+) m/z 416, 418 (M+H)+, Retention time=3.40 minutes (Method 2).

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