[NH2:1][C@@H:2]([CH3:8])[CH2:3][C:4]([O:6][CH3:7])=[O:5].Cl[C:10]([O:12][CH2:13][CH:14]=[CH2:15])=[O:11].C(N(C(C)C)CC)(C)C.O>C1COCC1>[CH2:13]([O:12][C:10]([NH:1][C@@H:2]([CH3:8])[CH2:3][C:4]([O:6][CH3:7])=[O:5])=[O:11])[CH:14]=[CH2:15]To a solution of methyl (3S)-3-aminobutanoate (1.47 g, 12.5 mmol) in THF (30 ml) were added at 0° C. allyl chloroformate (1.60 ml, 15.1 mmol) and diisopropylethylamine (2.62 ml, 15.0 mmol), and the mixture was stirred at the same temperature for 30 minutes. The reaction mixture was poured into water and extracted twice with ethylacetate. The organic layer was washed with a saturated aqueous sodium chloride solution, was dried over magnesium sulfate and the organic solvent was removed under reduced pressure. The residue was purified by silica gel (25 g) chromatography to give methyl (3S)-3-{[(allyloxy)carbonyl]amino}butanoate (2.06 g, 81%).
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