1,3-dihydro-1-(2-hydroxy-5-(trifluoromethyl)phenyl)-5-(trifluoromethyl)-2H-benzimidazol-2-one → HCID 19001544, compound

Participants

Reaction Steps

To an ice cooled solution of 1-(2-Hydroxy-5-trifluoromethylphenyl)-5-trifluoromethyl-1,3-dihydro-2H-benzimidazol-2-one (1.38 mmol, 0.50 g) in concentrated sulphuric acid (6 ml) is added an ice cooled solution of potassium nitrate (1.38 mmol, 0.14 g) in concentrated sulphuric acid (8 ml). The reaction mixture is allowed to reach room temperature and is poured into ice. The crude product is collected by filtration and subjected to column chromatography using methylenechloride+methanol (9+1 ) as eluent. The fractions containing the product are concentrated in vacuo yielding the title compound as slightly yellow crystals, M.p.>360° C.

Provenance & Evidence