[C:1]([O:5][C:6]([NH:8][C@H:9]([CH3:13])[C:10](O)=[O:11])=[O:7])([CH3:4])([CH3:3])[CH3:2].C(Cl)CCl.C1C=CC2N(O)N=[N:24]C=2C=1.N.O1CCOCC1.CN1CCOCC1>C(Cl)Cl>[NH2:24][C:10](=[O:11])[C@H:9]([NH:8][C:6](=[O:7])[O:5][C:1]([CH3:4])([CH3:3])[CH3:2])[CH3:13](R)-2-(tert-Butoxycarbonylamino)propanoic acid (1 g, 5.29 mmol), EDC (1.216 g, 6.34 mmol), and HOBt (0.971 g, 6.34 mmol) were dissolved in CH2Cl2 (5 mL). Ammonia (0.5 M) in dioxane (52.9 mL, 26.4 mmol) and 4-methylmorpholine (3.49 mL, 31.7 mmol) were added to the reaction mixture. After stirring for 1 h, the solvent was removed and ethyl acetate was added. This was washed with brine and saturated NaHCO3 solution. The organic layer was dried and concentrated to provide the product (R)-tert-butyl 1-amino-1-oxopropan-2-ylcarbamate (Int-X-A, 229 mg, 1.217 mmol, 23.02% yield); [M+Na]+=211.2; 1H NMR (400 MHz, methanol-d4) δ ppm 4.06 (1 H, q), 1.44 (9 H, s), 1.31 (3 H, d, J=7.04 Hz).
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