[F:1][C:2]([F:12])([F:11])[C:3]1[CH:4]=[C:5]([NH2:10])[CH:6]=[C:7]([NH2:9])[CH:8]=1.[CH3:13][S:14](Cl)(=[O:16])=[O:15]>N1C=CC=CC=1.C(Cl)Cl>[NH2:9][C:7]1[CH:6]=[C:5]([NH:10][S:14]([CH3:13])(=[O:16])=[O:15])[CH:4]=[C:3]([C:2]([F:11])([F:12])[F:1])[CH:8]=1A solution of 5-trifluoromethyl-benzene-1,3-diamine (250 mg, 1.42 mmol) in pyridine (0.52 mL) and CH2Cl2 (6.5 mL) was cooled to 0° C. Methanesulfonyl chloride (171 mg, 1.49 mmol) was slowly added at such a rate that the temperature of the solution remained below 10° C. The mixture was stirred at ˜8° C. and then allowed to warm to room temperature after 30 min. After stirring at room temperature for 4 h, reaction was almost complete as indicated by LCMS analysis. The reaction mixture was quenched with sat. aq. NH4Cl (10 mL) solution, extracted with CH2Cl2 (4×10 mL), dried over Na2SO4, filtered, and concentrated to yield N-(3-amino-5-trifluoromethyl-phenyl)-methanesulfonamide (D-19) as a reddish semisolid (0.35 g, 97%), which was used without further purification. 1H-NMR (CDCl3, 300 MHz) δ 6.76 (m, 1H), 6.70 (m, 1H), 6.66 (s, 1H), 3.02 (s, 3H); ESI-MS 255.3 m/z (MH+).
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