[ClH:1].[F:2][C:3]1([F:16])[CH2:7][CH2:6][C@@H:5]([NH:8]C(=O)OC(C)(C)C)[CH2:4]1>O1CCOCC1>[ClH:1].[F:2][C:3]1([F:16])[CH2:7][CH2:6][C@@H:5]([NH2:8])[CH2:4]1Hydrochloric acid (4M in dioxane, 60 mL) was added to a solution of (R)-tert-butyl 3,3-difluorocyclopentylcarbamate (4.61 g, 20.8 mmol) in dioxane (40 mL) at 0° C. After complete addition, the reaction mixture was allowed to warm to room temperature and stirred for 2 hours. The solvent was removed in vacuo and the residue was triturated with diethylether to afford the title compound as an off-white solid (2.68 g, 82% yield).
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