Oxalic Acid → (E)-6-Methoxy-1-(2-pyridyl)-2-styryl-1H-benzimidazole oxalate

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Free base of the titled compound was prepared from 5-methoxy-2-nitroaniline according to the preparation of (E)-1-(2-pyridyl)-2-styryl-5-trifluoromethyl-1H-benzimidazole (Example 57). The free base and oxalic acid were dissolved into ethyl acetate. Concentration and recrystallization from ethyl acetate-hexane yielded the titled compound. MW: 417.42; mp: 172.0-174.0° C.; 1H-NMR (DMSO) δ: 8.78-8.76 (1H, m), 8.18 (1H, td, J=7.8, 2.1 Hz), 7.78 (1H, d, J=16.1 Hz), 7.74 (1H, d, J=8.1 Hz), 7.66-7.55 (4H, m), 7.41-7.32 (3H, m), 7.11 (1H, d, J=15.8 Hz), 6.98-6.91 (2H, m), 3.75 (3H, s).

Provenance & Evidence