Water → 2-Methyl-2-({4-[2-({6-[4-(trifluoromethoxy)phenyl]pyridazin-3-yl}amino)ethyl]-1,3-thiazol-2-yl}thio)propionic acid tert-butyl ester

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Reaction Steps

Under nitrogen atmosphere, 2-[(4-{2-[(6-chloropyridazin-3-yl)amino]ethyl}-1,3-thiazol-2-yl)thio]-2-methylpropionic acid tert-butyl ester (500 mg) synthesized in Example 213-1 and 4-trifluoromethoxyphenylboric acid (300 mg) were dissolved in dioxane (6 mL) and 2 mol/L sodium carbonate (3 mL), tetrakis(triphenylphosphine)palladium (70 mg) was added, and the mixture was refluxed for 4 hr. The reaction mixture was cooled, water was added thereto, and the mixture was extracted with ethyl acetate. The organic layer was washed with saturated brine and dried over anhydrous sodium sulfate. The solvent was evaporated under reduced pressure, and the residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=3:2) to give the title compound (520 mg).

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