Ammonia → (rac)-4-[4-Cyano-2-(ethylsulfonyl)phenyl]-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxamide

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Reaction Steps

The reaction was carried out under argon. (rac)-4-[4-Cyano-2-(ethylsulfonyl)phenyl]-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid (1100 mg, 2.29 mmol) and HATU (2 eq., 1695 mg, 4.5 mmol) were initially charged in dry DMF (28 ml) at 0° C., and a 0.5 M solution of ammonia in dioxane (6 eq., 23.6 ml, 13.4 mmol) and DIEA (2 eq., 576 mg, 4.5 mmol) were added after brief stirring (20 min). The mixture was stirred at RT for 3 h (HPLC control). The reaction mixture was then diluted with ethyl acetate (200 ml). The organic phase was washed successively with saturated sodium bicarbonate solution (50 ml), 10% strength citric acid (3×50 ml) and saturated sodium chloride solution (50 ml), dried over solid sodium sulfate, filtered and concentrated. The residue was subjected to flash chromatography on silica gel (mobile phase: dichloromethane→dichloromethane/methanol 50:3). This gave a colorless solid (1050 mg, 96% of theory).

Provenance & Evidence