C(=O)([O-])[O-].[K+].[K+].Cl.[NH2:8][OH:9].[C:10]([C@@H:12]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:23])([CH3:22])[CH3:21])[CH2:13][CH:14]1[CH2:16][CH2:15]1)#[N:11]>O.C(O)C>[NH2:11]/[C:10](=[N:8]\[OH:9])/[C@@H:12]([NH:17][C:18](=[O:24])[O:19][C:20]([CH3:21])([CH3:23])[CH3:22])[CH2:13][CH:14]1[CH2:16][CH2:15]1Potassium carbonate (2.18 g, 16 mmol) was dissolved in water (8 mL) and hydroxylamine hydrochloride (1.1 g, 16 mmol) was added. A solution of (S)-tert-butyl 1-cyano-2-cyclopropylethylcarbamate (3.31 g, 16 mmol) in ethanol (24 mL) was added thereto and the resulting reaction mixture was stirred for 72 h. After evaporation of solvents, the residue was dissolved with ethyl acetate (20 mL) and then filtered. The filtrate was concentrated to yield crude product as yellow solid (3.61 g, 94%); MS (EI): m/e 244.2 [M+H]+.
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