[C:1]([O:5][C:6]([NH:8][C@H:9]([CH2:13][CH:14]1[CH2:16][CH2:15]1)[C:10](O)=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(Cl)CCl.C1C=CC2N(O)N=[N:27]C=2C=1.N>CN(C=O)C.O.CCOC(C)=O>[C:1]([O:5][C:6](=[O:7])[NH:8][C@H:9]([CH2:13][CH:14]1[CH2:16][CH2:15]1)[C:10]([NH2:27])=[O:11])([CH3:4])([CH3:3])[CH3:2]
To a solution of above mentioned (R)-2-(tert-butoxycarbonylamino)-3-cyclopropylpropanoic acid (1.0 g, 4.36 mmol) in DMF (10 ml) was added EDC (1.0 g, 5.24 mmol) and HOBt.H2O (367 mg, 2.4 mmol) at room temperature, 20 min later, it was added ammonia in (7N, 0.6 mL, 4 mmol) at room temperature. After stirring for 30 min, it was diluted with water and EtOAc, organic layer was separated and washed with Sat. NaHCO3, brine, dried and concentrated to give (R)-tert-butyl-1-amino-3-cyclopropyl-1-oxopropan-2-ylcarbamate (750 mg) as crude oil, which was treated with 4N HCl in Dioxane (5 mL). 30 min later, it was concentrated to give (R)-2-amino-2-cyclopropylacetamide hydrochloride salt.
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