Sodium Hydroxide → (3S,4aS,8aS)-2-((2R,3S)-3-amino-2-hydroxy-4-phenylbutyl)-N-tert-butyldecahydroisoquinoline-3-carboxamide

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A suspension of 41.37 g of methyl (1S,2R)-[1-benzyl-3-[(3S,4aS,8aS)-3-tert-butoxycarbamoyl-octahydro-isoquinolin-2-yl]-2-hydroxy-propyl]-carbamate and 23.0 g of sodium hydroxide in 90 ml of ethanol and 90 ml of water was heated at reflux for 3.5 hours, diluted with 45 ml of water and cooled to 22°, and the separated solid was filtered off, washed with a 1:4 mixture of ethanol/water and dried, there being obtained 35.35 g (98%) of pure 2-[3 (S)-amino-2(R)-hydroxy-4-phenyl-butyl]-N-tert.butyldecahydro-(4aS,8aS)-isoquinoline-3(S)-carboxamide, m.p. 173°-175° C. IR (KBr): 3435 m, hr. (NH, OH), 1665s (C=O), 1562 m (amide II).

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