[CH2:1]([O:8][C:9]1[CH:10]=[C:11]2[C:16](=[CH:17][CH:18]=1)[N:15]=[CH:14][C:13]([N+:19]([O-])=O)=[C:12]2[NH:22][CH2:23][CH2:24][CH2:25][CH2:26][NH:27][C:28](=[O:34])[O:29][C:30]([CH3:33])([CH3:32])[CH3:31])[C:2]1[CH:7]=[CH:6][CH:5]=[CH:4][CH:3]=1>C1(C)C=CC=CC=1.[Pt]>[NH2:19][C:13]1[CH:14]=[N:15][C:16]2[C:11]([C:12]=1[NH:22][CH2:23][CH2:24][CH2:25][CH2:26][NH:27][C:28](=[O:34])[O:29][C:30]([CH3:33])([CH3:32])[CH3:31])=[CH:10][C:9]([O:8][CH2:1][C:2]1[CH:3]=[CH:4][CH:5]=[CH:6][CH:7]=1)=[CH:18][CH:17]=2tert-Butyl [4-(6-benzyloxy-3-nitroquinolin-4-ylamino)butyl]carbamate (17.62 g, 37.77 mmol) was dissolved in toluene (600 mL) with heating and added to a Parr vessel charged with 5% platinum on carbon (2.20 g). The vessel was placed under hydrogen pressure (30 psi, 2.1×105 Pa) for three hours. The reaction mixture was filtered through a layer of CELITE filter aid, and the filtrate was concentrated under reduced pressure to provide 15.5 g of tert-butyl {4-[3-amino-6-(benzyloxy)quinolin-4-ylamino]butyl}carbamate as a brown solid.
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