1: With sodium tetrahydroborate; calcium chloride in tetrahydrofuran; ethanol T=4 - 5°C; 0.583333 h; 2: tert-butyl (3S)-3-hydroxy-3-{6-[(methylamino)carbonyl]-2-naphthyl}-3-(1-trityl-1H-imidazol-4-yl)propanoate in tetrahydrofuran; ethanol; water T=23 - 29°C; 6 h; 3: With hydrogenchloride in tetrahydrofuran; ethanol; water