[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[C:17](=[O:18])[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=3)[C:10]2=[O:19])=[CH:4][C:3]=1[O:20]C.B(Br)(Br)Br.CCOC(C)=O>C(Cl)Cl>[Cl:1][C:2]1[CH:7]=[CH:6][C:5]([CH2:8][N:9]2[C:17](=[O:18])[C:16]3[C:11](=[CH:12][CH:13]=[CH:14][CH:15]=3)[C:10]2=[O:19])=[CH:4][C:3]=1[OH:20]2-{[4-Chloro-3-(methyloxy)phenyl]methyl}-1H-isoindole-1,3(2H)-dione (7.0 g, 23 mmol) was dissolved in CH2Cl2 (25 mL) and cooled to 0° C. Boron tribromide (1.0 M solution, 46 mL) was added slowly then the solution was warmed to RT and stirred for 4 h. The reaction was cooled to 0° C. and ice water (100 mL) and EtOAc (200 mL) were added. The aqueous layer was separated and extracted with EtOAc (2×200 mL). The organic extracts were combined, dried over Na2SO4, filtered, evaporated and triturated with hexanes to afford the title compound (6.5 g, 97%) as a tan solid. 1H NMR (400 MHz, DMSO-d6): δ ppm 10.15 (s, 1H), 7.87 (d, 2H), 7.87 (ddd, 2H), 7.25 (d, 1H), 6.88 (d, 1H), 6.74 (dd, 1H), 4.66 (s, 2H). MS: m/z 286.0 (M−1).
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