Benzenesulfonamide, 3-amino- → 2-(4-Fluorophenoxy)-4-tert-butyl-N-(3-(aminosulfonyl)phenyl)benzamide

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A solution of 2-(4-fluorophenoxy)-4-tert-butylbenzoic acid (0.11 g, 0.39 mmol) and thionyl chloride (0.28 mL, 3.9 mmol) in CH2Cl2 (10 mL) was stirred at room temperature for 4 h. The solvent was evaporated under reduced pressure, and to the resulting oil was added a solution of 3-amino-benzenesulfonamide (73 mg, 0.42 mmol) in pyridine (4 mL). The solution was stirred at room temperature 15 h. The reaction was diluted with water and extracted with EtOAc. The combined extracts were washed with water, dried over Na2SO4, and evaporated under reduced pressure. The residue was purified by silica gel chromatography (0%-50% EtOAc-hexanes) to obtain a white solid which was recrystallized from EtOAc and hexanes. 2-(4-Fluorophenoxy)-4-tert-butyl-N-(3-(aminosulfonyl)phenyl)benzamide (85 mg, 50% yield) was obtained as a white solid. LC/MS: m/z 443.3 (M+H)+ at 3.49 min (10%-99% CH3CN (0.035% TFA)/H2O (0.05% TFA)).

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