[Br:1][C:2]1[C:3]([F:12])=[C:4]2[C:10]([NH2:11])=[CH:9][NH:8][C:5]2=[N:6][CH:7]=1.[O:13]1[CH2:17][CH2:16][CH2:15][C@H:14]1[C:18](O)=[O:19].C(N(CC)CC)C.C1N(P(Cl)(N2C(=O)OCC2)=O)C(=O)OC1.[Li+].[OH-]>C(Cl)Cl.O>[Br:1][C:2]1[C:3]([F:12])=[C:4]2[C:10]([NH:11][C:18]([C@@H:14]3[CH2:15][CH2:16][CH2:17][O:13]3)=[O:19])=[CH:9][NH:8][C:5]2=[N:6][CH:7]=1A mixture of 5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-amine (200 mg, 0.869 mmol), (S)-tetrahydrofuran-2-carboxylic acid (252 mg, 2.17 mmol), triethylamine (606 μL, 4.35 mmol), and BOP—Cl (203 mg, 2.17 mmol) in CH2Cl2 (10 mL) was stirred at room temperature for 7 hours. 2M LiOH (5 mL) was added then to the mixture and stirred at room temperature for 30 minutes. Water (25 mL) was then added and stirred for an additional 30 minutes. The solid formed was filtered, washed with water (3×5 mL) and dried to provide (S)—N-(5-bromo-4-fluoro-1H-pyrrolo[2,3-b]pyridin-3-yl)tetrahydrofuran-2-carboxamide (202 mg, 70.8% yield) as a solid. LCMS (APCI+) m/z 327.9, 329.9 (M+H)+; Retention time=2.80 minutes (Method 2).
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