[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([S:15]([NH:18][C:19]2[CH:20]=[C:21]([CH:25]=[CH:26][CH:27]=2)[C:22]([OH:24])=O)(=[O:17])=[O:16])=[CH:11][CH:10]=1.C(Cl)(=O)C([Cl:31])=O.CN(C=O)C>C(Cl)Cl>[Cl:1][C:2]1[CH:7]=[C:6]([Cl:8])[CH:5]=[CH:4][C:3]=1[C:9]1[CH:14]=[CH:13][C:12]([S:15]([NH:18][C:19]2[CH:20]=[C:21]([CH:25]=[CH:26][CH:27]=2)[C:22]([Cl:31])=[O:24])(=[O:17])=[O:16])=[CH:11][CH:10]=1A suspension of 3-(2′,4′-dichlorobiphenyl-4-ylsulfonamido)benzoic acid (1.50 g, 3.56 mmol) in DCM (35 mL) was stirred at 0° C. and oxalyl chloride (340 μL, 3.9 mmol) was added, followed by a catalytic amount of DMF (<50 μL). The mixture was allowed to warm to room temperature and stirred for two days, during which time the solid dissolved to form a light yellow clear solution. The mixture was evaporated under reduced pressure and the residue was azeotroped with toluene (3 mL), then hexane (10 mL) and the title compound obtained as a light brown, slightly gummy, solid (1.5 g) which was used without further purification.
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