Dichloromethane → (2S)-2-(t-butoxycarbonylamino)-3-[4-(1-methyluracil-3-yl)phenyl]propionic acid

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Reaktionsschritte

The mixture of 30 mg of (2S)-2-(t-butoxycarbonylamino)-3-[4-(dihydroxy boranyl)phenyl]propionic acid, 25 mg of 1-methyluracil, 27 mg of copper acetate(II), 40 mg of triethylamine and 4 ml of dichloromethane were stirred overnight. The reaction solvent was diluted by ethanol and filtered by Celite filtration. The residual material obtained by concentrating the filtrate was dilluted by 1N sodium hydroxide and washed with ethyl acetate. After making the water layer acidic by hydrochloric acid, the solution was extracted with ethyl acetate, washed with saturated NaCl aqueous solution, dried with magnesium sulfate and the solvent was removed to obtain a crude material of (2S)-2-(t-butoxycarbonylamino)-3-[4-(1-methyluracil-3-yl)phenyl]propionic acid. This crude material was diluted by 5 ml of ethanol and hexane solution including 2M trimethylsilyldiazomethane was added to give methyl ester. The reaction solvent was concentrated and purified by silica gel chromatography (ethyl acetate-ethanol) to obtain the title compound (7 mg).

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