Oxalic Acid → (E)-5-Methoxy-2-[2-(5-methyl-2-thienyl)ethenyl]-1-(2-pyridyl)-1H-benzimidazole oxalate

Participants

Reaction Steps

Free base of the titled compound was prepared from 4-methoxy-2-amino-N-(2-pyridyl)aniline and (E)-3-(5-methyl-2-thienyl)acryloyl chloride (Sekiya, T.; Hiranuma, H.; Hata, S.; Mizogami, S.; Hanazuka, M.; Yamada, S. J. Med Chem., 1983, 26, 411) according to the preparation of (E)-1-(2-pyridyl)-2-styryl-1H-benzimidazole (Example 1, method A). The free base and oxalic acid were dissolved into ethyl acetate. Concentration and recrystallization from MeOH/n-hexane yielded the titled compound. MW: 437.48; mp: 190.0-191.0° C.; 1H-NMR (DMSO) δ: 8.67-8.63 (1H, m), 8.06 (1H, td, J=7.9, 1.9 Hz), 7.79 (1H, d, J=15.6 Hz), 7.59 (1H, d, J=7.9 Hz), 7.54-7.48 (1H, m), 7.22 (1H, d, J=8.7 Hz), 7.12-7.08 (2H, m), 6.77 (1H, dd, J=8.7, 2.5 Hz), 6.71-6.68 (1H, m), 6.66 (1H, d, J=15.6 Hz), 3.72 (3H, s), 2.33 (3H, s).

Provenance & Evidence