[Cl:1][C:2]1[CH:3]=[CH:4][CH:5]=[C:6]2[C:11]=1[CH:10]=[N:9][CH:8]=[CH:7]2.[Br:12]Br.Cl>[N+](C1C=CC=CC=1)([O-])=O.CCOCC>[Br:12][C:7]1[C:6]2[C:11](=[C:2]([Cl:1])[CH:3]=[CH:4][CH:5]=2)[CH:10]=[N:9][CH:8]=1To a solution of 8-chloroisoquinoline (1.0 g, 6.1 mmol) in nitrobenzene (20 mL) at 180° C. was added bromine (0.35 mL, 6.7 mmol) over 10 min. Heating and stirring were continued for 2 hours. The mixture was allowed to cool to about 80° C., then 2M HCl in Et2O (5 mL) was added, followed by Et2O (5 mL) and hexanes (60 mL). The resulting slurry was filtered, washed with hexane and dried. The collected solid was dissolved in water, then the solution was adjusted to pH 9 with Na2CO3 (aq). The solution was extracted with EtOAc. The organic layer was dried over Na2SO4, filtered, and concentrated. The residue was purified by silica gel chromatography eluting with 0-20% EtOAc/hexanes to afford the title compound as a white solid: 1H NMR (500 MHz, CDCl3): δ 9.62 (s, 1H); 8.83 (s, 1H); 8.13 (t, J=5.0 Hz, 1H); 7.74 (d, J=5.0 Hz, 2H). LC6: 4.08 min, (M+H): 242.
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