[Br:1][CH2:2][CH2:3][NH:4][S:5]([C:7]([CH3:10])([CH3:9])[CH3:8])=[O:6].C1C=C(Cl)C=C(C(OO)=[O:19])C=1>>[Br:1][CH2:2][CH2:3][NH:4][S:5]([C:7]([CH3:10])([CH3:9])[CH3:8])(=[O:19])=[O:6]To a solution of 2-methyl-propane-2-sulfinic acid (2-bromo-ethyl)-amide (0.8 g, 3.5 mmol) was added mCPBA (77%, 0.95 g, 4.2 mmol) and stirred at a temperature of about 25° C. for 2 hrs. The reaction mixture was condensed and purified to provide 2-methyl-propane-2-sulfonic acid (2-bromo-ethyl)-amide as a white solid (0.4 g, 46% yield).
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