[NH2:1][C:2]1[C:3]([Cl:12])=[C:4]([C:8]([Cl:11])=[CH:9][CH:10]=1)[C:5]([OH:7])=[O:6].C(N(CC)CC)C.[CH2:20]([S:23](Cl)(=[O:25])=[O:24])[CH2:21][CH3:22]>ClCCl>[Cl:12][C:3]1[C:2]([NH:1][S:23]([CH2:20][CH2:21][CH3:22])(=[O:25])=[O:24])=[CH:10][CH:9]=[C:8]([Cl:11])[C:4]=1[C:5]([OH:7])=[O:6]3-Amino-2,6-dichlorobenzoic acid (1.40 g, 6.82 mmol) was dissolved in dry dichloromethane (66.7 mL). Triethylamine (4.09 mL, 29.4 mmol) was added, and the mixture was chilled to 0° C. Propane-1-sulfonyl chloride (2.48 mL, 22 mmol) was then added via syringe. Once the addition was complete, the mixture was allowed to warm to ambient temperature and stir for 1 hour. The mixture was concentrated in vacuo and diluted with diethyl ether. The mixture was washed with 0.25M NaOH (80 mL), and the aqueous layer was acidified to a pH of 1 using 1.0M HCl. The aqueous layer was extracted with 15% 2-propanol:DCM (2×300 mL). The organic layer was collected, dried over sodium sulfate, and concentrated to afford 2,6-dichloro-3-(propylsulfonamido)benzoic acid (1.55 g, 4.96 mmol, 74.4% yield). 1H NMR (400 MHz, d6-DMSO) δ 9.77-9.75 (s, 1H), 7.84-7.80 (d, 1H), 7.71-7.68 (d, 1H), 3.82-3.72 (m, 2H), 1.89-1.70 (m, 2H), 1.05-1.03 (m, 3H).
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