[Cl:1][C:2]1[CH:3]=[C:4]([S:11]([N:14]=[CH:15][N:16]([CH3:18])[CH3:17])(=[O:13])=[O:12])[CH:5]=[C:6]([F:10])[C:7]=1[CH2:8]O.C1C=CC(P(C2C=CC=CC=2)C2C=CC=CC=2)=CC=1.C(Br)(Br)(Br)[Br:39]>C(Cl)Cl>[Br:39][CH2:8][C:7]1[C:6]([F:10])=[CH:5][C:4]([S:11]([N:14]=[CH:15][N:16]([CH3:18])[CH3:17])(=[O:13])=[O:12])=[CH:3][C:2]=1[Cl:1]To a solution of N′-(3-chloro-5-fluoro-4-(hydroxymethyl)phenylsulfonyl)-N,N-dimethylformimidamide (600 mg, 2 mmol) in DCM (10 mL) at 0° C. were added PPh3 (1.06 g, 4.06 mmol) and CBr4 (1.3 g, 4.06 mmol). The resulting solution was stirred at room temperature for 30 min, concentrated, and purified by column chromatography (silica, DCM/EtOAc=20:1) to afford N′-(4-(bromomethyl)-3-chloro-5-fluorophenylsulfonyl)-N,N-dimethylformimidamide (673 mg, 92%) as ivory solid. 1H NMR (400 MHz, CDCl3) δ 8.18-8.11 (m, 1H), 7.78 (d, 1H), 7.57 (dd, 1H), 4.64 (d, 2H), 3.22 (d, 3H), 3.10 (t, 3H); MS (EI) m/z 379 (M+Na+).
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