[CH2:1]([O:8][C:9]1[CH:17]=[CH:16][C:12]([C:13]([OH:15])=O)=[CH:11][CH:10]=1)[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1.[C:18]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])(=[O:21])[NH:19][NH2:20].Cl.CN(C)CCCN=C=NCC.O.ON1C2C=CC=CC=2N=N1>CN(C)C=O.CO.C(Cl)Cl.CCN(CC)CC>[CH2:1]([O:8][C:9]1[CH:10]=[CH:11][C:12]([C:13]([NH:20][NH:19][C:18]([O:22][C:23]([CH3:26])([CH3:25])[CH3:24])=[O:21])=[O:15])=[CH:16][CH:17]=1)[C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1A mixture of 4-benzyloxybenzoic acid (0.780 g, 3.42 mmol), tert-butyl carbazate (0.443 g, 3.35 mmol), Et3N (0.5 mL), 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (1.05 g, 5.47 mmol) and 1-hydroxybenzotriazole hydrate (0.778 g, 5.76 mmol) in N,N-dimethylformamide (27 mL) was stirred at room temperature for 2 days. The reaction was concentrated and diluted in dichloromethane. The organic phase was washed twice with water, dried with MgSO4 and concentrated. The residue was purified on column chromatography (silica gel, 5% MeOH in CH2Cl2) and tert-butyl 2-[4-(benzyloxy)benzoyl]hydrazine carboxylate (0.998 g, yield: 85%) was identified by NMR spectroscopy.
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