[CH3:1][S:2](Cl)(=[O:4])=[O:3].[NH2:6][C:7]1[CH:16]=[C:15]([CH3:17])[CH:14]=[CH:13][C:8]=1[C:9]([O:11][CH3:12])=[O:10].C(N(CC)CC)C.Cl>ClCCl>[CH3:17][C:15]1[CH:14]=[CH:13][C:8]([C:9]([O:11][CH3:12])=[O:10])=[C:7]([N:6]([S:2]([CH3:1])(=[O:4])=[O:3])[S:2]([CH3:1])(=[O:4])=[O:3])[CH:16]=1.[CH3:17][C:15]1[CH:14]=[CH:13][C:8]([C:9]([O:11][CH3:12])=[O:10])=[C:7]([NH:6][S:2]([CH3:1])(=[O:4])=[O:3])[CH:16]=1Methanesulphonyl chloride (12.2 ml) was added to a stirred, cooled solution of methyl 2-amino-4-methylbenzoate (10.3 g) and triethylamine (19.5 ml) in dichloromethane while maintaining the temperature below 0° C. The mixture was stirred at room temperature for 4 hours. Hydrochloric acid solution (2M) was added and the layers were separated. The organic layer was washed with water, dried (magnesium sulphate) and filtered. The filtrate was evaporated to dryness to give a mixure of methyl 4-methyl-2-[N,N-bis(methylsulphonyl)amino]benzoate and methyl 4-methyl-2-(N-methylsulphonylamino)benzoate (18.26 g) as a yellow solid which was not further purified.
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