Barium hydroxide, monohydrate → (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-(5-methoxy-2-(pent-4-enyl)benzylamino)butan-2-ol

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Step AH (6): To a solution of benzyl (2S,3R)-1-(3,5-difluorophenyl)-3-hydroxy-4-(5-methoxy-2-(pent-4-enyl)benzylamino)butan-2-ylcarbamate trifluoroacetate salt (91.3 mg, 0.140 mmol) in DME (9.0 mL) and water (6.0 mL) was added barium hydroxide monohydrate (831.2 mg, 4.389 mmol). The reaction mixture was stirred at 110° C. in a high-pressure vial for 18 h. The reaction was filtered through a pad of celite and the filtrate was concentrated in vacuum. The residue was purified by silica gel chromatography to give (2R,3S)-3-amino-4-(3,5-difluorophenyl)-1-(5-methoxy-2-(pent-4-enyl)benzylamino)butan-2-ol double trifluoroacetate salt (45.8 mg, 52%) as colorless oil. LC-MS (M+H)+=405.42. 1H NMR (CD3OD, 500 MHz) δ 7.30-6.75 (m, 6H) 5.86 (m, 1H) 5.02 (m, 2H) 4.33 (m, 1H) 3.81 (s, 3H) 3.72 (m, 2H) 3.37 (m, 1H) 3.12-2.92 (m, 2H) 2.75-2.60 (m, 2H) 2.14 (m, 2H) 1.65 (m, 2H) 1.53 (m, 2H).

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