5-bromo-1-(2,4-dimethoxybenzyl)-7-(trifluoromethyl)-1,3-dihydro-2H-benzimidazol-2-one → 1-(2,4-dimethoxybenzyl)-2-oxo-7-(trifluoromethyl)-2,3-dihydro-1H-benzimidazole-5-carbonitrile

Participants

Reaction Steps

To a solution of 5-bromo-1-(2,4-dimethoxybenzyl)-7-(trifluoromethyl)-1,3-dihydro-2H-benzimidazol-2-one (1090.7 mg) and copper(I) cyanide (793.8 mg) in N,N-dimethylformamide (100 ml) was heated at reflux for 34 hours. The reaction mixture was concentrated in vacuo. To the resultant residue were added saturated aqueous sodium bicarbonate solution and water, and the mixture was extracted with ethyl acetate. The organic layer was dried over anhydrous magnesium sulfate, and concentrated in vacuo to give the title compound (1076.5 mg, quantitative yield). HPLC retention time: 30.54 min (condition 2).

Provenance & Evidence