[OH:1][C:2]1[CH:11]=[CH:10][C:5]2N[C:7](=[O:9])[NH:8][C:4]=2[CH:3]=1.[Br:12][CH2:13][CH2:14][CH2:15][CH2:16]Br.C([O-])([O-])=O.[K+].[K+].[CH3:24][CH2:25]O>O>[Br:12][CH2:13][CH2:14][CH2:15][CH2:16][O:1][C:2]1[CH:3]=[C:4]2[C:5]([CH:24]=[CH:25][C:7](=[O:9])[NH:8]2)=[CH:10][CH:11]=1
A mixture of intermediate 38 (253 mg, 1.68 mmol), 1,4-dibromobutane (0.6 mL, 5.04 mmol) and anhydrous K2CO3 (232 mg, 1.68 mmol) was dissolved in EtOH and the solution was heated to reflux overnight. The solution was diluted with water and extracted with EtOAc. The combined organic layers were washed with saturated NaHCO3, brine, dried over anhydrous Na2SO4, concentrated in vacuo and purified by flash chromatography on silica gel column (elution with PE/EtOAc=4:1) to give 7-(4-bromobutoxy)quinolin-2(1H)-one (intermediate 48) (120 mg, 25%) as a yellow solid.
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