[C:1]([O:5][C:6]([NH:8][C:9]([CH3:22])([CH3:21])[CH:10]([O:17]C(=O)C)[C:11](=[O:16])[NH:12][CH:13]1[CH2:15][CH2:14]1)=[O:7])([CH3:4])([CH3:3])[CH3:2].[OH-].[Na+].Cl>CO>[C:1]([O:5][C:6](=[O:7])[NH:8][C:9]([CH3:22])([CH3:21])[CH:10]([C:11](=[O:16])[NH:12][CH:13]1[CH2:15][CH2:14]1)[OH:17])([CH3:4])([CH3:2])[CH3:3]To a solution of acetic acid 2-tert-butoxycarbonylamino-1-cyclopropylcarbamoyl-2-methylpropyl ester in MeOH (10 mL) was added 10% NaOH (1.5 mL). The reaction mixture was stirred at room temperature for 3 h and then acidified with 1N Hydrochloric acid to pH 7. The reaction mixture was extracted with EtOAc. The organic layer was dried (Na2SO4) concentrated to yield (2-cyclopropylcarbamoyl-2-hydroxy-1,1-dimethylethyl)-carbamic acid tert-butyl ester which was used in the next step without further purification.
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