[O:1]=[C:2]1[NH:8][C:7]2[S:9][CH:10]=[CH:11][C:6]=2[C:5]([C:12]2[CH:21]=[CH:20][C:15]([C:16]([O:18][CH3:19])=[O:17])=[CH:14][CH:13]=2)=[N:4][CH2:3]1.[Br:22]Br>N1C=CC=CC=1>[Br:22][C:10]1[S:9][C:7]2[NH:8][C:2](=[O:1])[CH2:3][N:4]=[C:5]([C:12]3[CH:13]=[CH:14][C:15]([C:16]([O:18][CH3:19])=[O:17])=[CH:20][CH:21]=3)[C:6]=2[CH:11]=1In a 20 mL dram screw-cap vial with septum was dissolved compound 493 (0.140 g, 0.466 mmol) in pyridine (3 mL) to give an orange solution. The mixture was cooled to 0° C. and bromine (0.029 mL, 0.559 mmol) was added dropwise. The reaction mixture was left to stir at 0° C. for 1 hour. The mixture was quenched with saturated thiosulfate solution and extracted with ethyl acetate. The organic layer was washed several times with water, then brine, dried over magnesium sulfate, filtered and evaporated. The residue was suspended in ether and filtered to afford title compound 494 (101 mg, 57%) as a tan solid. MS (m/z): 379.33 (M+H).
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