Trifluoroacetic acid → 1-{2-[6-(3-Hydroxyazetidin-1-yl)pyrimidin-4-yl]-3-oxo-2,3-dihydro-1H-pyrazol-4-yl}-1H-imidazole-4-carbonitrile

Participants

Reaction Conditions

Reaction Steps

46 μl (68 mg, 0.6 mmol) of trifluoroacetic acid are added to a mixture of 700 mg (3.0 mmol) of the compound from Example 6A and 541 mg (3.0 mmol) of the compound from Example 10A in 10 ml of ethyl acetate, and the mixture is stirred at 100° C. for 10 h. The reaction mixture is concentrated under reduced pressure and taken up in 5 ml of ethanol, and the precipitate is filtered off. The solid is suspended in 10 ml of water, and 1 N aqueous sodium hydroxide solution (pH=9) is added until the solid is dissolved. The pH is then adjusted to 7 using 1 N hydrochloric acid, the mixture is concentrated to a volume of about 5 ml and the precipitate formed is filtered off. The residue is washed with water and diisopropyl ether and chromatographed by preparative HPLC (Method 8). The solid is then suspended in 10 ml of water, and 1 N aqueous sodium hydroxide solution (pH=9) is added until the solid is dissolved. The pH is then adjusted to 7 using 1 N hydrochloric acid, the mixture is concentrated to a volume of about 2.5 ml and the precipitate formed is filtered off. The filtrate is concentrated to about 2 ml and filtered again. Both residues are combined, washed with water and ethyl acetate and dried under reduced pressure. Yield: 78 mg (8% of theory)

Provenance & Evidence