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

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Reaction Steps

Free base of the titled compound was prepared from 4-methyl-2-amino-N-(2-pyridyl)aniline and (E)-3-Cyclohexylacryloyl chloride 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 ethyl acetate/n-hexane yielded the titled compound. MW: 407.47; mp: 141.0-142.0° C.; 1H-NMR (DMSO) δ: 8.73-8.71 (1H, m), 8.14 (1H, t, J=7.0 Hz), 7.61-7.56 (2H, m), 7.46 (1H, s), 7.26 (1H, d, J=8.1 Hz), 7.05 (1H, d, J=8.1 Hz), 6.92 (1H, dd, J=15.8, 7.0 Hz), 6.38 (1H, d, J=15.8 Hz), 2.42 (3H, s), 2.25-2.10 (1H, m), 1.80-1.55 (5H, m), 1.40-1.05 (5H, m).

Provenance & Evidence