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

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A mixture of N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)-5-methylisoxazole-3-carboxamide (200 mg, 0.590 mmol) and (R)-tert-butyl piperidin-3-ylcarbamate (591 mg, 2.95 mmol) in n-BuOH (5 mL) was stirred at 150° C. for 24 hours in a sealed tube. The reaction mixture was then concentrated in vacuo, and the liquid residue was purified by C-18 reverse phase flash chromatography (Biotage C-18 Flash 25M+) on Biotage SP4 unit eluting with 10-80% CH3CN/water gradient (24 CV). The product isolated was crystallized from MeOH/CH3CN to provide (R)-tert-butyl 1-(5-bromo-3-(5-methylisoxazole-3-carboxamido)-1H-pyrrolo[2,3-b]pyridin-4-yl)piperidin-3-ylcarbamate (40 mg, 13% yield) as a solid. LCMS (APCI+) m/z 519, 521 (M+H)+, Retention time=4.08 minutes (Method 2).

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