Ammonia → (4R)-4-(4-Cyano-2-nitrophenyl)-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. At RT, (4R)-4-(4-Cyano-2-nitrophenyl)-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid (6.0 g, 11.4 mmol, 85% pure), DMAP (140 mg, 1.143 mmol; 0.1 eq.), DIEA (1.77 g, 13.7 mmol; 1.2 eq.) and PyBOP (7.14 g, 13.71 mmol; 1.2 eq.) were initially charged in dry THF (34 ml), after brief stirring (15 min), a 0.5 M solution of ammonia in THF (5 eq., 57.1 mmol) was added and the mixture was then stirred at RT for 1 h. Ethyl acetate (250 ml) was then added to the reaction mixture. The organic phase was washed successively with saturated sodium bicarbonate solution, water and saturated sodium chloride solution, dried over sodium sulfate, filtered and concentrated under reduced pressure. The crude product was subjected to flash chromatography on silica gel (mobile phase: dichloromethane/methanol 20:1). The title compound was obtained as a colorless solid (5.0 g, 98% of theory).

Provenance & Evidence