[CH3:1][C:2]1[C:10]2[O:9][C:8](=[O:11])[NH:7][C:6]=2[CH:5]=[CH:4][CH:3]=1.Cl[S:13]([OH:16])(=[O:15])=[O:14]>>[CH3:1][C:2]1[C:10]2[O:9][C:8](=[O:11])[NH:7][C:6]=2[CH:5]=[CH:4][C:3]=1[S:13]([OH:16])(=[O:15])=[O:14]7-Methyl-3H-benzooxazol-2-one [5.0 g, 33 mmol, prepared according to the procedure described in J. Org. Chem. (1982), 47(14), 2804–6) was treated with chlorosulphonic acid as described in Example 15 (i) to give the title compound as an off-white solid (4.5 g, 60%).
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