L-Phenylalanine → (3s)-3-Amino-2-hydroxy-4-phenylbutanoic acid

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Process for the production of 2-[3-(S)-amino-2(R)-hydroxy-4-phenylbutyl]-N-tert.-butyl-decahydro-(4aS,8aS)-isoquinoline-3(S)-carboxamide of the formula ##STR20## characterised in that a) L-phenylalanine of the formula ##STR21## is reacted with phthalic anhydride, b) the resultant 3-phenyl-2(S)-phthalimidopropionic acid of the formula ##STR22## is converted into the corresponding acid chloride, c) the resultant 3-phenyl-2(S)-phthalimidopropionic acid chloride of the formula ##STR23## is reduced, d) the resultant 3-phenyl-2(S)-phthalimidopropan-1-al of the formula ##STR24## is transformed into the 1-cyano-3-phenyl-2(S)-phthalimidopropan-1-ol of the formula ##STR25## e) the resultant nitrile of the formula VI is hydrolysed, f) the unisolated 3(S)-amino-2-hydroxy-4-phenylbutyric acid formed of the formula ##STR26## is reacted with a low alkyl ester or the phenyl or benzyl ester of chloroformic acid,

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