[C:1]([O:4][CH2:5][C:6]1[S:7][CH:8]=[CH:9][C:10]=1[CH3:11])(=[O:3])[CH3:2].N1C=CC=CC=1.[Br:18]Br>C(Cl)Cl>[C:1]([O:4][CH2:5][C:6]1[S:7][C:8]([Br:18])=[CH:9][C:10]=1[CH3:11])(=[O:3])[CH3:2]To a solution of 62.3 (0.61 g, 3.58 mmol) and pyridine (0.29 mL, 3.58 mmol) in DCM (24 mL) was added bromine (3.58 mL, 1.0 M solution in DCM) dropwise at 0° C. The mixture was stirred for 30 minutes at 0° C. and warmed to room temperature over 1 hour. Upon completion, the reaction was diluted with DCM, washed with saturated Na2S2O3 and brine, dried (Na2SO4), and concentrated to afford 62.4. The crude product was used without further purification.
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