[Br:1]N1C(=O)CCC1=O.[CH3:9][C:10]1[CH:11]=[C:12]([S:16]([Cl:19])(=[O:18])=[O:17])[CH:13]=[CH:14][CH:15]=1>C(Cl)(Cl)(Cl)Cl.CC(N=NC(C#N)(C)C)(C#N)C>[Br:1][CH2:9][C:10]1[CH:11]=[C:12]([S:16]([Cl:19])(=[O:18])=[O:17])[CH:13]=[CH:14][CH:15]=1Add N-bromosuccinimide (9.34 g, 52.5 mmol) and AIBN (5 mg, 0.32 mmol) to a solution of 3-methyl-benzenesulfonyl chloride (10.0 g, 52.5 mmol) in carbon tetrachloride (52 mL), and heat the solution at reflux for 12 hours. Filter the mixture to remove solids and condense under reduced pressure to afford a thick oil. Purify by flash chromatography to yield the title compound as an off-white crystalline solid (5.24 g, 19.4 mmol): 1H NMR (CDCl3) δ 4.54 (s, 2H), 7.62 (m, 1H), 7.78 (m, 1H), 7.98 (m, 1H), 8.06 (m, 1H).
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