C(OC([N:8]1[CH:12]([C@@H:13]([O:39][CH2:40][C:41]2[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=2)[C@@H:14]([N:24]([CH2:32][C:33]2[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=2)[CH2:25][C:26]2[CH:31]=[CH:30][CH:29]=[CH:28][CH:27]=2)[CH2:15][C:16]2[CH:21]=[C:20]([F:22])[CH:19]=[C:18]([F:23])[CH:17]=2)[CH2:11][O:10]C1(C)C)=O)(C)(C)C.Cl>O1CCOCC1>[NH2:8][C@@H:12]([C@@H:13]([O:39][CH2:40][C:41]1[CH:46]=[CH:45][CH:44]=[CH:43][CH:42]=1)[C@@H:14]([N:24]([CH2:25][C:26]1[CH:27]=[CH:28][CH:29]=[CH:30][CH:31]=1)[CH2:32][C:33]1[CH:38]=[CH:37][CH:36]=[CH:35][CH:34]=1)[CH2:15][C:16]1[CH:21]=[C:20]([F:22])[CH:19]=[C:18]([F:23])[CH:17]=1)[CH2:11][OH:10]Dissolve 4-[(1S,2S)-1-benzyloxy-2-dibenzylamino-3-(3,5-difluorophenyl)-propyl]-2,2-dimethyloxazolidine-3-carboxylic acid tert-butyl ester (2.42 g, 3.68 mmol) in dry dioxane (16 mL). To the solution add 4 M hydrogen chloride in 1,4-dioxane (32.2 mL, 129 mmol) and stir for three hours. Concentrate to give the hydrochloride salt of the desired product as a white solid (2.17 g, 100%). Slurry the solid in ethyl acetate (150 mL) and stir vigorously with saturated sodium bicarbonate (100 mL). Separate the layers and dry (magnesium sulfate) to give the desired compound.
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