Hydrochloric Acid → 7-(4-Chlorophenyl)-8-isopropyl-2-trifluoromethyl-3H-chromeno[7,8-d]imidazol-6-one

Participants

Reaction Conditions

Reaction Steps

7,8-Diamino-3-(4-chlorophenyl)-2-isopropyl-chromen-4-one (80 mg, 0.243 mmol) is dissolved in trifluoroacetic acid (1.4 ml), dilute hydrochloric acid (2M, 0.1 ml) is added, and the mixture is heated at 110° C. for 2.5 h. The reaction mixture is cooled to room temperature, diluted with ethyl acetate (50 ml) and washed with saturated sodium bicarbonate solution (2×40 ml), water (40 ml) and saturated brine (40 ml). The organic layer is dried (MgSO4), filtered and evaporated to give a solid. This is triturated with dichloromethane containing a few drops of ethyl acetate and filtered to give a colourless powder.

Provenance & Evidence