[NH2:1][C:2]1[CH:9]=[CH:8][CH:7]=[CH:6][C:3]=1[CH2:4][NH2:5].C(N(CC)CC)C.O1CCOCC1.[C:23](=O)([O:29]C(C)(C)C)[O:24][C:25]([CH3:28])([CH3:27])[CH3:26]>O1CCOCC1.O.C(OCC)(=O)C>[C:25]([O:24][C:23]([NH:5][CH2:4][C:3]1[CH:6]=[CH:7][CH:8]=[CH:9][C:2]=1[NH2:1])=[O:29])([CH3:28])([CH3:27])[CH3:26]2-Aminobenzylamine (5.0 g, 40.9 mmol) and triethylamine (4.1 g, 40.9 mmol) were dissolved in a mixed solvent (50 ml) of dioxane-water (2:1). A dioxane solution (8.9 g/10 ml) of di-t-butyl carbonate was added dropwise to the solution under cooling with ice water. The mixture was stirred for 2 hours as it was. After the reaction mixture was diluted with ethyl acetate, an aqueous phase was removed, and an organic phase was washed 3 times with water and once with saturated brine, and dried over anhydrous magnesium sulfate. The solvent was distilled off under reduced pressure, and the residue was crystallized from diisopropyl ether-hexane to obtain 6.70 g of the title compound.
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