[N:1]1[CH:6]=[CH:5][CH:4]=[CH:3][C:2]=1[CH2:7][NH:8][C:9](=[O:23])[C:10]1[CH:15]=[CH:14][C:13]([NH:16][C:17](=O)[CH3:18])=[C:12]([N+:20]([O-])=O)[CH:11]=1.C(O)(=O)C.[H][H]>[Pd].C(O)C>[CH3:18][C:17]1[NH:20][C:12]2[CH:11]=[C:10]([C:9](=[O:23])[NH:8][CH2:7][C:2]3[CH:3]=[CH:4][CH:5]=[CH:6][N:1]=3)[CH:15]=[CH:14][C:13]=2[N:16]=1Five-percent palladium on carbon (0.10 g) was added to a mixture of 1.00 g of crude N-(2-pyridylmethyl)-4-acetylamino-3-nitrobenzamide, 8 ml of acetic acid and 12 ml of ethanol, and the solution was stirred in a hydrogen atmosphere at 80° C. for 7 hours. The solid material was separated through filtration, and the filtrate was concentrated. Ethyl acetate was added to the residue for crystallization. The crystals were separated through filtration, and were dried to give 0.57 g of 2-methyl-5-[(2-pyridylmethyl)carbamoyl]benzimidazole (252).
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