Dichloromethane → N-(4-(cis-3-amino-4-fluoropiperidin-1-yl)-5-bromo-1H-pyrrolo[2,3-b]pyridin-3-yl)isobutyramide hydrochloride

Participants

Reaction Conditions

Reaction Steps

A mixture of N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)isobutyramide (0.11 g, 0.37 mmol; Example 15, Step A), benzyl-cis-4-fluoropiperidin-3-ylcarbamate (0.19 g, 0.75 mmol; Example F) and DIEA (0.26 mL, 1.49 mmol) in n-BuOH (2 mL) was stirred at 155° C. (bath) for 22 hours. The solvent was removed, and the residue was dissolved in ethyl acetate (20 mL), washed with water (10 mL), brine (10 mL), dried (sodium sulfate) and concentrated in vacuo. The residue was purified by reverse phase chromatography (Biotage SP4, C-18 25M+, 10-80% CH3CN/water, 30 CV). The product isolated was dissolved in DCM (3 mL), and TMS-I (0.16 mL, 1.12 mmol) was added. The reaction mixture was stirred at room temperature for 2 hours. The solvent was removed in vacuo, water (10 mL) and ether (30 mL) were added. The aqueous layer was separated, basified with 30% potassium carbonate to a pH of about 9, and extracted with DCM (2×20 mL). The combined organic layers were dried (sodium sulfate) and concentrated in vacuo. The residue was dissolved in DCM (3 mL), and 2N HCl in ether (2 mL) was added. The solid formed was collected to give N-(4-(cis-3-amino-4-fluoropiperidin-1-yl)-5-bromo-1H-pyrrolo[2,3-b]pyridin-3-yl)isobutyramide hydrochloride (36 mg, 21%) as a solid. 1H NMR (400 MHz, D2O) δ 8.25 (s, 1H), 7.27 (s, 1H), 3.86 (m, 1H), 3.62 (m, 1H), 3.41 (m, 2H), 3.20 (m, 1H), 2.64 (m, 1H), 2.12 (m, 2H), 1.96 (m 1H), 1.11 (t, 6H). LCMS (APCI+) m/z 398 (M+H)+.

Provenance & Evidence