To a mixture of ethyl 3-amino-1-methylpyrazole-4-carboxylate (P. Schmidt et al. Hel. Chim. Acta., 1959, 41, 349.) (2.30 g) and potassium carbonate in N,N-dimethylformamide (70 ml), was added portionwise 4-bromomethyl-2'-cyanobiphenyl (4.81 g). The solvent was distilled under reduced pressure. To the residue was added ice-water and an aqueous solution of potassium carbonate. The mixture was extracted with ethyl acetate. The extract was washed with water and a saturated aqueous saline solution, which was dried over magnesium sulfate. The solvent was distilled off under reduced pressure to give crude crystals, which were recrystallization from ethyl acetate-isopropylether to afford the title compound as white crystals (3.7 g, 76%), m.p. 151°-152° C.
