HCID 18680797, compound → HCID 18680884, compound

Participants

Reaction Steps

Methanol (30 ml) and 5% palladium/carbon (0.20 g) are added to a mixture (2.32 g) of 2-methyl-1-(4-nitrobenzyl)-6-[(2-pyridylmethyl)carbamoyl]benzimidazole and 2-methyl-1-(4-nitrobenzyl)-5-[(2-pyridylmethyl)carbamoyl]benzimidazole, and the solution is stirred at room temperature under a nitrogen environment until the raw materials dissolved. Solid materials are separated through filtration. The filtrate is concentrated and a residue is obtained. The residue is purified through medium pressure silica gel column chromatography (eluate: ethyl acetate/methanol=85/15), and 1-(4-aminobenzyl)-2-methyl-6-[(2-pyridylmethyl)carbamoyl]benzimidazole and 1-(4-aminobenzyl)-2-methyl-5-[(2-pyridylmethyl)carbamoyl]benzimidazole are separated. These materials are crystallized in mixed solvents of chloroform and diethylether. The crystals are separated through filtration, dried and thus, 1-(4-aminobenzyl)-2-methyl-6-[(2-pyridylmethyl)carbamoyl]benzimidazole (0.354 g) (197) and 1-(4-aminobenzyl)-2-methyl-5-[(2-pyridylmethyl)carbamoyl]benzimidazole (0.330 g) (198) are obtained. 1H-NMR (CDCl3, δ): 3.00 (3H, s), 4.98 (2H, s), 5.88 (2H, s), 7.55 (2H, d, J=8.6 Hz), 7.69 (2H, d, J=8.6 Hz), 7.90 (1H, d, J=8.6 Hz), 7.96 (1H, dt, J=7.1 and 0.6 Hz), 8.12 (1H, J=8.0 Hz), 8.18 (1H, dd, J=8.5 and 1.4 Hz), 8.55 (1H, dt, J=8.0 and 1.7 Hz), 8.62 (1H, d,J=1.1 Hz), 8.77(1H, dd, J=5.9 and 1.1 Hz).

Provenance & Evidence