[C:1](=[O:24])([O:16][CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1)[O:2][C:3]1[C:8]2[NH:9][C:10](=[O:12])[S:11][C:7]=2[C:6]([C:13](=[O:15])[CH3:14])=[CH:5][CH:4]=1.[Br-:25].[Br-].[Br-].C1([N+](C)(C)C)C=CC=CC=1.C1([N+](C)(C)C)C=CC=CC=1.C1([N+](C)(C)C)C=CC=CC=1>C1COCC1.O>[C:1](=[O:24])([O:2][C:3]1[C:8]2[NH:9][C:10](=[O:12])[S:11][C:7]=2[C:6]([C:13](=[O:15])[CH2:14][Br:25])=[CH:5][CH:4]=1)[O:16][CH2:17][C:18]1[CH:23]=[CH:22][CH:21]=[CH:20][CH:19]=1To a solution of 7-acetyl-2-oxo-2,3-dihydro-1,3-benzothiazol-4-yl benzyl carbonate (280 mg) in dry THF (20 ml) stirring under nitrogen, was added phenyltrimethylammonium tribromide (330 mg). The mixture was heated at 80° C. for 2 h and then diluted with water, extracted with ethyl acetate, dried (MgSO4), filtered, and evaporated in vacuo. The residue was purified on a 40 g silica biotage cartridge and eluted with 20% ethyl acetate-cyclohexane to give the title compound (186 mg). LCMS RT=3.43 min.
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