[CH2:1]([S:4]([NH:7][C:8]1[CH:9]=[C:10]([CH:14]=[CH:15][CH:16]=1)[C:11](O)=[O:12])(=[O:6])=[O:5])[CH2:2][CH3:3].S(Cl)([Cl:19])=O>>[CH2:1]([S:4]([NH:7][C:8]1[CH:9]=[C:10]([CH:14]=[CH:15][CH:16]=1)[C:11]([Cl:19])=[O:12])(=[O:6])=[O:5])[CH2:2][CH3:3]A solution of 3-(propane-1-sulfonylamino)-benzoic acid (76, 1.20 g, 4.93 mmol) in thionyl chloride was heated to reflux for 3.0 hours. Evaporation of the solvent gave compound 77 as white solid that was used for the next step.
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