Lithium Hydroxide → N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)isobutyramide

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Reaction Steps

Isobutyric acid (306 mg, 3.48 mmol), bis(2-oxooxazolidin-3-yl)phosphinic chloride (885 mg, 3.48 mmol) and triethylamine (880 mg, 8.69 mmol) were added to 5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-amine (400 mg, 1.74 mmol) in DCM (200 mL). The reaction was stirred at room temperature for 1 hour, and then 3M aqueous LiOH (4 mL) was added. The reaction as stirred for 1 hour, and then saturated aqueous Na2CO3 was added (200 mL). The aqueous phase was extracted 3 times with DCM (200 mL). Then the combined organic phases were dried over MgSO4 and concentrated to dryness. The residue was purified by C-18 reverse phase flash chromatography (Biotage SP4 unit, C-18 25M column, 20-100% CH3CN/water gradient; 20 CV) to yield N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)isobutyramide (158 mg, 30% yield) as a solid. 1H NMR (400 MHz, (CD3)2SO) δ 12.03 (br s, 1H), 9.40 (s, 1H), 8.34 (d, 1H), 7.56 (d, 1H), 2.69-2.62 (m, 1H), 1.12 (d, 6H); LCMS (APCI+) m/z 299.9, 301.9 (M+H)+, Retention time=3.02 minutes (Method 3).

Provenance & Evidence