[Br:1][C:2]1[C:11]([O:12]C)=[C:10]([CH3:14])[CH:9]=[C:8]2[C:3]=1[CH:4]=[CH:5][CH:6]=[N:7]2.B(Br)(Br)Br.CO>C(Cl)Cl>[Br:1][C:2]1[C:11]([OH:12])=[C:10]([CH3:14])[CH:9]=[C:8]2[C:3]=1[CH:4]=[CH:5][CH:6]=[N:7]2To the solution of 5-bromo-6-methoxy-7-methylquinoline (6.5 g, 25.8 mmol) in DCM (150 mL) was added BBr3 slowly (77.3 mL, 1.0 M in DCM, 77.3 mmol). The mixture was stirred for 3 hours and cooled to 0° C. Methanol (40 mL) was added slowly and the mixture was stirred for 20 minutes. The solvents were removed under reduced pressure. The solid was dissolved in methanol (100 mL) and was treated with 1.0 N sodium hydroxide solution (50 mL) (pH ˜12). The mixture was stirred for 12 hours and acetic acid was added to adjust pH to between 4-5. The mixture was filtered and washed with water. The gray solid was dried under reduced pressure to give 5-bromo-7-methylquinolin-6-ol (5.0 g). LCMS-ESI+ (m/z): 238.2, 240.1 (M+H)+, 236.1, 238.0 (M−H).
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