[NH2:1][C:2]1[N:7]=[CH:6][C:5]([CH:8]2[CH2:12][N:11]([CH3:13])[C:10](=[O:14])[CH2:9]2)=[CH:4][CH:3]=1.C1C(=O)N([Br:22])C(=O)C1.C(=O)(O)[O-].[Na+]>C(#N)C.CCOC(C)=O>[NH2:1][C:2]1[N:7]=[CH:6][C:5]([CH:8]2[CH2:12][N:11]([CH3:13])[C:10](=[O:14])[CH2:9]2)=[CH:4][C:3]=1[Br:22]To 4-(6-aminopyridin-3-yl)-1-methylpyrrolidin-2-one (90 mg, 0.377 mmol) in Acetonitrile 3 mL) in ice bath was added NBS (60.3 mg, 0.339 mmol). The reaction mixture was stirred in ice bath for 15 min and room temperature for 30 min. LC-MS shows mixture of SM and product. Added 0.1 equiv. more of NBS and stirred another 1h at room temperature. Reaction mixture was diluted with EtOAc and added 2 mL of Satd sodium bicarbonate. Stirred 10 min. The organic layer was separated, dried over sodium sulfate, filtered and evaporated. Proceed for next step (73%). LCMS (m/z): 270.2/272.2 (MH+), 0.302 min.
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