Water → 2-Methyl-2-{[4-(2-oxo-2-{[4'-(trifluoromethyl)biphenyl-4-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-[(4-bromophenyl)amino]-2-oxoethyl}-1,3-thiazol-2-yl)thio]-2-methylpropionic acid tert-butyl ester (600 mg) synthesized in Example 458-1 and 4-trifluoromethylphenylboric acid (363 mg) were dissolved in dioxane (8 mL) and 2M aqueous sodium carbonate solution (4 mL), tetrakis(triphenylphosphine)palladium (73 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=2:1) to give the title compound (550 mg) as a colorless oil.

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