[CH3:1][C:2]1[C:7]([N+:8]([O-])=O)=[C:6]([CH3:11])[N:5]=[C:4]([O:12][CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])[N:3]=1.[H][H]>C(O)C.[Pd]>[NH2:8][C:7]1[C:2]([CH3:1])=[N:3][C:4]([O:12][CH2:13][C:14]([O:16][CH2:17][CH3:18])=[O:15])=[N:5][C:6]=1[CH3:11]Compound 6 (75.98 g) and 5% Pd—C (7.598 g, N. E. CHEMCAT, STD Type) were suspended in ethanol (760 mL). Evacuation and replacement with hydrogen were repeated three times. Subsequently, the suspension was vigorously stirred at room temperature (20 to 30° C.) for 4.5 hours under hydrogen atmosphere. After the reaction was completed, the mixture was subjected to high precision pressure filtration (0.2 μm, PTFE) and the filtered product was washed with ethanol (474 mL). The filtrate was evaporated under reduced pressure to give 66.99 g (99.9% yield) of the desired product as a pale yellow solid.
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