[Br:1][C:2]1[CH:3]=[C:4]([F:11])[C:5]([CH2:9]Br)=[C:6]([F:8])[CH:7]=1.[CH2:12]1[NH:19][CH2:18][CH2:17][S:14](=[O:16])(=[O:15])[CH2:13]1.C(N(CC)CC)C>ClCCl>[Br:1][C:2]1[CH:3]=[C:4]([F:11])[C:5]([CH2:9][N:19]2[CH2:18][CH2:17][S:14](=[O:16])(=[O:15])[CH2:13][CH2:12]2)=[C:6]([F:8])[CH:7]=1A solution of 3.8 g (11.3 mmol) 5-bromo-2-bromomethyl-1,3-difluoro-benzene, 1.83 g (13.6 mmol) thiomorpholine dioxide and 1.88 ml (13.6 mmol) triethylamine in 40 ml dichloromethane is stirred at room temperature for 20 h. Then the reaction mixture is poured on water and extracted 3× with EtOAc. The combined organic layers are washed with water and saturated NaCl solution, dried over MgSO4, filtered and the filtrate is concentrated in vacuo. The residue is taken up in diethylether, vigorously stirred, and the title compound is obtained after filtration as a white crystalline solid.
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