Methyl iodide → (4R)-4-(4-Cyano-2-nitrophenyl)-3,6-dimethyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carbonitrile

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The reaction was carried out under argon. (4R)-4-(4-Cyano-2-nitrophenyl)-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carbonitrile (5.0 g, 11.7 mmol) was initially charged in absolute THF (500 ml), and a 1 M solution of lithium hexamethyldisilazide (LiHMDS) in THF (13.5 ml, 13.5 mmol; 1.15 eq.) was added at −78° C. After 30 min of stirring, iodomethane (8.30 g, 58.5 mmol; 5 eq.) in THF was added and the mixture was stirred for 16 h while slowly warming from −78° C. to RT. The reaction mixture was then concentrated under reduced pressure, and initially 1 N hydrochloric acid (14.0 ml) and then MTBE (500 ml) were added. The organic phase was washed successively with water (2×), saturated sodium bicarbonate solution, saturated ammonium chloride solution and saturated sodium chloride solution, dried over sodium sulfate, filtered and concentrated under reduced pressure. The title compound was obtained as a solid (4.3 g, 83% of theory).

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