[C:1]([O:4][C@@H:5]([C:22]1[CH:27]=[CH:26][C:25]([F:28])=[CH:24][CH:23]=1)[C@@H:6]([NH:14]C(OC(C)(C)C)=O)[C:7](=[O:13])[N:8]1[CH2:12][CH2:11][CH2:10][CH2:9]1)(=[O:3])[CH3:2].[ClH:29]>CCOCC>[ClH:29].[C:1]([O:4][C@@H:5]([C:22]1[CH:27]=[CH:26][C:25]([F:28])=[CH:24][CH:23]=1)[C@@H:6]([NH2:14])[C:7](=[O:13])[N:8]1[CH2:9][CH2:10][CH2:11][CH2:12]1)(=[O:3])[CH3:2]A solution of (1S,2R)-2-(tert-butoxycarbonylamino)-1-(4-fluorophenyl)-3-oxo-3-(pyrrolidin-1-yl)propyl acetate, CCH 23140-2 (104 mg, 264 μmol), in Et2O (20 mL) in a 100 mL round-bottomed flask equipped with a magnetic stirbar was stirred for 1 h at RT in presence of a stream of HCl. The reaction mixture was concentrated and dried for 3 days under vacuum to obtain (1S,2R)-2-amino-1-(4-fluorophenyl)-3-oxo-3-(pyrrolidin-1-yl)propyl acetate hydrochloride, Compound 17, as a white solid (86 mg, 98% yield).
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