[CH3:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]#[N:13])=[CH:4][CH:3]=1.C1C(=O)N([Br:21])C(=O)C1.CC(N=NC(C#N)(C)C)(C#N)C>C(Cl)(Cl)(Cl)Cl.O>[Br:21][CH2:1][C:2]1[C:11]2[C:6](=[CH:7][CH:8]=[CH:9][CH:10]=2)[C:5]([C:12]#[N:13])=[CH:4][CH:3]=1To a stirred solution of 4-methyl-1-naphthonitrile (5 g, 30 mmol) in CCl4 (50 mL) under argon atmosphere was added NBS (6.06 g, 34.09 mmol), and the reaction mixture was degassed for 30 min AIBN (0.3 g, 2.1 mmol) was added, and the resultant reaction mixture was heated at reflux for 4 h. The reaction mixture was cooled to ambient temperature, diluted with H2O and extracted with CH2Cl2 (3×100 mL). The combined CH2Cl2 layer was washed with brine, dried over Na2SO4, and concentrated under reduced pressure. The residue was purified by flash column chromatography (SiO2, 100-200 mesh; 5% EtOAc in n-Hexane) to afford the title compound as a white solid (3.8 g, 52%): mp 131-133° C.; 1H NMR (400 MHz, CDCl3) δ 8.33 (m, 1H), 8.24 (m, 1H), 7.88 (d, J=8.0 Hz, 1H), 7.78 (m, 2H), 7.62 (d, J=8.0 Hz, 1H), 4.95 (s, 2H); ESIMS m/z 245.92 ([M+H]+); IR (thin film) 2217 cm−1.
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