[F:1][C:2]1[CH:3]=[CH:4][C:5]([C@H:8]2[CH2:12][O:11][C:10](=[O:13])[NH:9]2)=[N:6][CH:7]=1.[H-].[Na+].[Br:16][C:17]1[CH:18]=[N:19][N:20]2[CH:25]=[CH:24][C:23](Cl)=[N:22][C:21]=12.O>CN(C=O)C>[Br:16][C:17]1[CH:18]=[N:19][N:20]2[CH:25]=[CH:24][C:23]([N:9]3[C@@H:8]([C:5]4[CH:4]=[CH:3][C:2]([F:1])=[CH:7][N:6]=4)[CH2:12][O:11][C:10]3=[O:13])=[N:22][C:21]=12
To a solution of (S)-4-(5-fluoropyridin-2-yl)oxazolidin-2-one (4.3 g, 24 mmol) in DMF (75 mL) was added sodium hydride (0.94 g, 24 mmol) in portions and the reaction stirred for 15 minutes at room temperature, followed by the addition of 3-bromo-5-chloropyrazolo[1,5-a]pyrimidine (5.5 g, 24 mmol) in a solution of DMF (50 mL) and the reaction was stirred for an additional 1 hour. The reaction was poured into water (400 mL) and extracted into ether (400 mL). The water layer was separated and washed with ether (200 mL). The combined organic layers were washed with water (100 mL) and brine (200 mL), dried over MgSO4 and concentrated in vacuo. The crude material was chromatographed using 15% EtOAc/DCM as eluent to yield (S)-3-(3-bromopyrazolo[1,5-a]pyrimidin-5-yl)-4-(5-fluoropyridin-2-yl)oxazolidin-2-one (6.7 g, 18 mmol, 75% yield).
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