[C:1]([NH:4][C:5]1[CH:10]=[CH:9][C:8]([S:11](Cl)(=[O:13])=[O:12])=[C:7]([F:15])[CH:6]=1)(=[O:3])[CH3:2].[CH3:16][NH2:17]>ClCCl.C1COCC1>[F:15][C:7]1[CH:6]=[C:5]([NH:4][C:1](=[O:3])[CH3:2])[CH:10]=[CH:9][C:8]=1[S:11](=[O:13])(=[O:12])[NH:17][CH3:16]The above prepared 4-acetylamino-2-fluorobenzenesulfonyl chloride (2 g, 7.9 mmol) was dissolved in dichloromethane and methylamine (9.9 mL of a 2M solution in THF, 19.9 mmol) was added. The reaction was stirred at room temperature for 2 hrs. The solvent was then evaporated under reduced pressure and the resulting solid was suspended in 50 mL of water. The solid was isolated by filtration and dried to yield 1.55 g (79%) of N-(3-fluoro-4-methylsulfamoylphenyl)acetamide which was used in the subsequent step without further purification.
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