Water → (rac)-4-{4-Cyano-2-[(1-methylethyl)sulfonyl]phenyl}-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carbonitrile

Participants

Reaction Steps

The reaction was carried out under argon. (rac)-4-{4-Cyano-2-[(1-methylethyl)sulfonyl]phenyl}-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxamide (730 mg, 1.44 mmol) was initially charged in dry THF (35 ml), methoxycarbonylsulfamoyltriethylammonium hydroxide (Burgess reagent; 687 mg, 2.88 mmol; 2 eq.) was added and the mixture was stirred at RT. After 75 min, HPLC control showed complete conversion. Water (20 ml) was then added, the reaction mixture was concentrated and the residue was taken up in ethyl acetate (200 ml). The organic phase was washed with saturated sodium chloride solution (3×30 ml), dried over solid sodium sulfate, filtered and concentrated. The residue was subjected to flash chromatography on silica gel (mobile phase: cyclohexane→cyclohexane/ethyl acetate 1:1). The title compound was obtained as a colorless solid (700 mg, 99% of theory).

Provenance & Evidence