[Br:1][C:2]1[CH:3]=[C:4]([NH2:10])[C:5]([O:8][CH3:9])=[N:6][CH:7]=1.C[Si]([N-][Si](C)(C)C)(C)C.[Na+].[OH:21][C:22]1[CH:27]=[CH:26][C:25]([S:28](Cl)(=[O:30])=[O:29])=[CH:24][C:23]=1[CH3:32].C(=O)(O)[O-].[Na+]>C1COCC1>[Br:1][C:2]1[CH:3]=[C:4]([NH:10][S:28]([C:25]2[CH:26]=[CH:27][C:22]([OH:21])=[C:23]([CH3:32])[CH:24]=2)(=[O:30])=[O:29])[C:5]([O:8][CH3:9])=[N:6][CH:7]=15-Bromo-2-methoxypyridin-3-amine (1.08 g, 5.32 mmol) was dissolved in THF (2.5 ml) and cooled with an ice bath. A solution of sodium bis(trimethylsilyl)amide (1 M in THF, 8 ml, 8 mmol) was added dropwise. Ten minutes later, 4-hydroxy-3-methylbenzene-1-sulfonyl chloride (1.65 g, 5.91 mmol, prepared according to JP 47015818 B4 19720511) in THF (3 ml) was added and the reaction mixture was allowed to reach room temperature. After stirring for 1 h, a saturated solution of sodium bicarbonate was added dropwise and the reaction mixture was extracted with dichloromethane (×3). The organic phase was dried over magnesium sulphate, filtered and the solvent evaporated under reduced pressure. The resulting residue was purified by reverse phase chromatography using SP1® Purification System (C-18 silica from Waters®, water/1:1 acetonitrile-methanol as eluents [0.1% v/v formic acid buffered] 0% to 100%) to give 230 mg (12% yield) of the title compound. Purity 100%.
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