Triethyl Phosphate → Allyl(rac)-4-[4-cyano-2-(methylsulfanyl)phenyl]-6-methyl-2-oxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydropyrimidine-5-carboxylate

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Reaction Steps

The reaction was carried out under argon. Triethyl phosphate (1.46 g, 8.04 mmol) and diphosphorus pentoxide (761 mg, 5.36 mmol) were stirred at 50° C. overnight. The mixture was then diluted with MTBE (27 ml), and 4-formyl-3-(methylsulfanyl)benzonitrile (1.18 g, 6.70 mmol; Example 9A), 1-[3-(trifluoromethyl)phenyl]urea (1.37 g, 6.70 mmol) and allyl acetoacetate (1.43 g, 10.1 mmol) were added. The mixture was stirred under reflux overnight. For work-up, the solvent was removed under reduced pressure and the residue was suspended in diethyl ether and then filtered of with suction. This gave 978 mg (19% of theory) of the title compound.

Provenance & Evidence