[Cl:1][C:2]1[CH:3]=[C:4]([C@H:8]([N:18]2C(=O)C3C(=CC=CC=3)C2=O)[CH2:9][NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14])[CH:5]=[CH:6][CH:7]=1.O.NN>C(O)C>[NH2:18][C@@H:8]([C:4]1[CH:5]=[CH:6][CH:7]=[C:2]([Cl:1])[CH:3]=1)[CH2:9][NH:10][C:11](=[O:17])[O:12][C:13]([CH3:16])([CH3:15])[CH3:14]To a solution of (S)-tert-butyl (2-(3-chlorophenyl)-2-(1,3-dioxoisoindolin-2-yl)ethyl)carbamate (5.0 g, 12.47 mmol) in ethanol (41.6 mL) was added hydrazine hydrate (6.06 mL, 125 mmol). The reaction mixture was heated at 60° C. for 2 h. The reaction mixture was filtered through Celite pad. The filtrate was concentrated and the residue was diluted with DCM and filtered off through Celite. The same process was repeated until no white precipitate was shown. To remove the white side product completely, the product was dissolved in 1N HCl (30 mL), washed with EtOAc, and the aqueous phase was neutralized to pH 7 then back-extracted by EtOAc. The organic was dried over anhydrous sodium sulfate, filtered off, and concentrated in vacuo yielding (S)-tert-butyl (2-amino-2-(3-chlorophenyl)ethyl)carbamate (89%). LCMS (m/z): 271.1 (MH+), 0.58 min.
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