Acetic Acid → Methyl 1-[(2'-cyano[1,1'-biphenyl]-4-yl)methyl]-2-ethoxy-1H-benzimidazole-7-carboxylate

Participants

Reaction Conditions

Reaction Steps

Acetic acid (0.37 g) was added to a solution of methyl 3-amino-2-[[(2'-cyanobiphenyl-4-yl)methyl]amino]benzoate (2.03 g) in ethyl orthocarbonate (5 ml), and the mixture was stirred at 80° C. for one hour. The reaction mixture was concentrated to dryness and the residue was dissolved in ethyl acetate. The solution was washed with an aqueous solution of sodium hydrogen carbonate and water. The solvent was evaporated in vacuo to give crystals. Recrystallization from ethyl acetate-hexane afforded colorless crystals (2.01 g, 86%), m.p. 168.5°-169.5° C.

Provenance & Evidence