Pyridine → 2-(2-chlorophenyl)-1-(4-chlorophenyl)-5-ethyl-1 H-imidazole-4-carboxylic acid [7-(2-amino-ethoxyimino)-7-[4-(trifluoromethyl)phenyl] heptyl]-amide

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Reaction Steps

Part C: 2-(2-chlorophenyl)-1-(4-chlorophenyl)-5-ethyl-1H-imidazole-4-carboxylic acid {7-[4-(trifluoromethyl)phenyl]-7-oxo-heptyl}amide (1.15 g, 1.86 mmol) was dissolved in absolute ethanol (10 ml), and O-(2-aminoethyl)hydroxylamine dihydrochloride (0.276 mg, 1.865 mol) and pyridine (0.18 ml) were successively added. The resulting mixture was stirred at reflux temperature for 20 hours. The mixture was allowed to attain room temperature. After removal of the solvent in vacuo, the residue was dissolved in dichloromethane and washed successively with an aqueous KHSO4 solution and brine. The organic layer was subsequently dried over Na2SO4, filtered and concentrated in vacuo to give 2-(2-chlorophenyl)-1-(4-chlorophenyl)-5-ethyl-1 H-imidazole-4-carboxylic acid [7-(2-amino-ethoxyimino)-7-[4-(trifluoromethyl)phenyl] heptyl]-amide (Compound 2) (1.34 g) as a mixture of E/Z stereoisomers. Melting point: 90-95° C. 1H-NMR (400 MHz, CDCl3) δ 1.05 (t, J=7, 3H), 1.34-1.62 (m, 8H), 2.81 (br t, J=7, 2H), 2.93 (q, J=7, 2H), 3.32-3.42 (m, 4H), 4.44-4.50 (m, 2H), 7.11 (d, J=8, 2H), 7.21-7.34 (m, 5H), 7.37 (d, J=8, 1H), 7.49 (br s, 1H), 7.59 (d, J=8, 2H), 7.71 (d, J=8, 2H), 8.65 (br s, 2H).

Provenance & Evidence