4-Bromophenol → 2-({4-[2-(4-Bromophenoxy)ethyl]-1,3-thiazol-2-yl}thio)-2-methylpropionic acid tert-butyl ester

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Reaction Steps

2-{[4-(2-Hydroxyethyl)-1,3-thiazol-2-yl]thio}-2-methylpropionic acid tert-butyl ester (3.077 g) synthesized in Example 4 and 4-bromophenol (1.75 g) were dissolved in tetrahydrofuran (50 mL), triphenylphosphine (3.20 g) and diisopropyl diazodicarboxylate (40% toluene solution, 6.54 ml) were added under ice-cooling, and the mixture was stirred at room temperature for 12 hr. The reaction mixture was concentrated under reduced pressure, and the residue was purified by silica gel chromatography (elution solvent; hexane:ethyl acetate=10:1 to 5:1) to give the title compound (3.45 g) as a colorless oil.

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