[Br:1][C:2]1[CH:3]=[C:4]([NH2:11])[C:5]([O:8][CH2:9][CH3:10])=[N:6][CH:7]=1.[OH:12][C:13]1[CH:18]=[CH:17][C:16]([S:19](Cl)(=[O:21])=[O:20])=[CH:15][C:14]=1[CH3:23]>>[Br:1][C:2]1[CH:3]=[C:4]([NH:11][S:19]([C:16]2[CH:17]=[CH:18][C:13]([OH:12])=[C:14]([CH3:23])[CH:15]=2)(=[O:21])=[O:20])[C:5]([O:8][CH2:9][CH3:10])=[N:6][CH:7]=15-Bromo-2-ethoxypyridin-3-amine (506 mg, 2.33 mmol) was treated with 4-hydroxy-3-methylbenzene-1-sulfonyl chloride (506 mg, 2.45 mmol, prepared as described at JP 47015818 B4 19720511) according to the method described in Preparation 15b to give 902 mg (100% yield) of the title compound as an oil. Purity 99%.
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