[OH:1][C:2]1[CH:7]=[CH:6][C:5]([C:8]2[CH:9]=[C:10]3[C:15](=[CH:16][CH:17]=2)[CH:14]=[C:13]([OH:18])[CH:12]=[CH:11]3)=[CH:4][CH:3]=1.C1C(=O)N([Br:26])C(=O)C1.O>C(#N)C>[Br:26][C:14]1[C:15]2[C:10](=[CH:9][C:8]([C:5]3[CH:6]=[CH:7][C:2]([OH:1])=[CH:3][CH:4]=3)=[CH:17][CH:16]=2)[CH:11]=[CH:12][C:13]=1[OH:18]To a solution of 6-(4-hydroxyphenyl)-2-naphthol (4.02 g, 17.0 mmol) in acetonitrile (150 mL) at 0° C. was added NBS (3.03 g, 17.0 mmol). The reaction was stirred at 0° C. for 3 hr and then poured into water (200 mL) and extracted with ethyl acetate (3×300 mL). The combined organic layers were washed with water, dried over sodium sulfate, filtered, evaporation of the solvent, and purification by silica column chromatography (20% ethyl acetate—hexanes) yielded 5.33 g (100%) of the title compound as a tan solid. The title compound was further purified by reverse phase HPLC to yield a white solid: mp 208-210° C.; 1H NMR (DMSO-d6): δ 6.89 (2H, d, J=8.47 Hz), 7.28 (1H, d, J=8.80 Hz), 7.63 (2H, d, J=8.50 Hz), 7.85 (2H, d, J=8.84 Hz), 8.02-8.06 (2H, m), 9.60 (1H, s), 10.54 (1H, s); MS (ESI) m/z 313/315 (M−H)−.
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