[C:1]([O:5][C:6]([NH:8][C@H:9]([CH:13]1[CH2:15][CH2:14]1)[C:10](O)=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(Cl)CCl.C1C=CC2N(O)N=[N:26]C=2C=1.N.CO>CN(C=O)C.O.CCOC(C)=O>[C:1]([O:5][C:6](=[O:7])[NH:8][C@H:9]([CH:13]1[CH2:15][CH2:14]1)[C:10]([NH2:26])=[O:11])([CH3:4])([CH3:3])[CH3:2]To a solution of (R)-2-(tert-butoxycarbonylamino)-2-cyclopropylacetic acid (430 mg, 2 mmol) in DMF (6 ml) was added EDC (461 mg, 2.4 mmol) and HOBt. H2O (367 mg, 2.4 mmol) at room temperature, 20 min later, it was added ammonia in MeOH (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-2-amino-1-cyclopropyl-2-oxoethylcarbamate (330 mg) as crude oil, which was treated with 4N HCl in Dioxane (2 mL). 30 min later, it was concentrated to give (R)-2-amino-2-cyclopropylacetamide hydrochloride salt.
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