[C:1]([O:5][C:6](=[O:19])[CH2:7][CH:8]([NH:12][C:13]([O:15][CH2:16][CH:17]=[CH2:18])=[O:14])[C:9]([OH:11])=O)([CH3:4])([CH3:3])[CH3:2].Cl.[CH3:21][O:22][NH:23][CH3:24].CN1CCOCC1.Cl.CN(C)CCCN=C=NCC>C(Cl)Cl>[C:1]([O:5][C:6](=[O:19])[CH2:7][CH:8]([NH:12][C:13]([O:15][CH2:16][CH:17]=[CH2:18])=[O:14])[C:9]([N:23]([O:22][CH3:21])[CH3:24])=[O:11])([CH3:2])([CH3:3])[CH3:4]2-Allyloxycarbonylamino-succinic acid 4-tert-butyl ester, 100, (43.4 g, 0.159 mol) is dissolved in CH2Cl2(900 mL). To this solution O,N-dimethyl-hydroxylamine hydrochloride (18.6 g, 0.191 mol), 4-Methyl-morpholine (21.0 mL, 19.3 g, 0.191 mol), and 1-(3-Dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (36.6 g, 0.191 mol) are added. After the consumption of the starting material, the solution is washed with 1.0 N HCl (2×400 mL) and brine (1×250 mL). The organic layer is concentrated in vacuo and the residue purified over silica (hexanes/ethyl acetate 65:35) to afford 40.8 g (81% yield) of the desired product as a clear oil.
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