C[O:2][C:3]1[CH:4]=[N:5][CH:6]=[CH:7][C:8]=1[C:9]1[C:13]2[C:14](=[O:30])[N:15]([CH2:18][CH2:19][C:20]3[CH:29]=[CH:28][C:27]4[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=4)[N:21]=3)[CH:16]=[CH:17][C:12]=2[S:11][CH:10]=1.B(Br)(Br)Br.[OH-].[Na+].C(Cl)[Cl:38]>>[ClH:38].[OH:2][C:3]1[CH:4]=[N:5][CH:6]=[CH:7][C:8]=1[C:9]1[C:13]2[C:14](=[O:30])[N:15]([CH2:18][CH2:19][C:20]3[CH:29]=[CH:28][C:27]4[C:22](=[CH:23][CH:24]=[CH:25][CH:26]=4)[N:21]=3)[CH:16]=[CH:17][C:12]=2[S:11][CH:10]=1To 3-(3-methoxypyridin-4-yl)-5-[2-(quinolin-2-yl)ethyl]thieno[3,2-c]pyridin-4(5H)-one (50.0 mg, 0.121 mmol) in DCM (20 mL) was added 1M BBr3 in DCM (0.363 mmol, 91 mg). The reaction mixture was stirred for 2 h under nitrogen. The reaction mixture was poured onto water and basified with 1N NaOH, extracted with DCM and dried. The organic phase was concentrated to dryness and the residue was purified by column chromatography (normal phase) on silica using DCM/methanol to give the title compound (13 mg, 0.030 mmol).
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