[CH2:1]([NH:8][S:9]([C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([CH2:18][OH:19])[CH:13]=1)(=[O:11])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>C(Cl)Cl.O=[Mn]=O>[CH2:1]([NH:8][S:9]([C:12]1[CH:17]=[CH:16][CH:15]=[C:14]([CH:18]=[O:19])[CH:13]=1)(=[O:11])=[O:10])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1Reaction N-Benzyl-3-hydroxymethyl-benzenesulfonamide (crude from previous step, 1.36 mmol), MnO2 (1.40 g, 13.60 mmol) in CH2Cl2 (10 mL) at 40° C. under N2 overnight gave the title compound (317 mg, 85%) as a white solid.
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