Acetic Acid → (2S)-2-Amino-3-(4-(2-methoxycarbonyl-ethyl)-benzoylamino)-propionic acid tert-butyl ester

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Reaction Steps

6.88 g (14.2 mmol) of tert-butyl (2S)-2-benzyloxycarbonylamino-3-(4-(2-methoxycarbonyl-ethyl)-benzoylamino)propionate was dissolved in 200 ml of methanol and 852 mg (14.2 mmol) of acetic acid was added. The mixture was hydrogenated for 7 hours at room temperature over Pd/C (5% strength) at 1 bar of hydrogen. The mixture was filtered and the solvent was removed in vacuo. The residue was washed with n-heptane and dried in vacuo. Yield 6.9 g. MS (ES+): m/e=351.2 (M+H+).

Provenance & Evidence