To a solution of N-{4-[4-iodo-5-(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-1,2,4-triazol-3-yl)-1,3-oxazol-2-yl]-5-methylpyridin-2-yl}acetamide (0.33 g, 0.601 mmol) in 1,4-dioxane (4 mL) was added tris(dibenzylideneacetone)dipalladium(0) (0.055 g, 0.060 mmol), Xantphos (0.10 g, 0.18 mmol), isothiazolidine 1,1-dioxide (0.36 g, 3.01 mmol) and cesium carbonate (0.98 g, 3.00 mmol). The mixture was degassed with nitrogen and then subjected to microwave irradiation at 140° C. for 2.5 h. The mixture was diluted with water and extracted with EtOAc. The organic solutions were combined, dried over MgSO4, filtered and concentrated. The residue was purified by column chromatography to give N-{4-[4-(1,1-dioxidoisothiazolidin-2-yl)-5-(1-{[2-(trimethylsilyl)ethoxy]methyl}-1H-1,2,4-triazol-3-yl)-1,3-oxazol-2-yl]-5-methylpyridin-2-yl}acetamide which was used directly in the next step. LCMS (FA): m/z=534.6 (M+H).
