Hydrochloric Acid → Methyl 4-(4-cyanophenyl)-6-methyl-2-thioxo-1-[3-(trifluoromethyl)phenyl]-1,2,3,4-tetrahydro-5-pyrimidinecarboxylate

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To a solution of 3-trifluoromethylphenylthiourea (2.2 g, 10 mmol) 4-cyanobenzaldehyde (1.4 g, 11 mmol) and methyl acetoacetate (1.2 mL, 11 mmol) in THF (40 mL) was added trimethylsilylphosphate (1.8 g) and the mixture heated at 70° C. After 17 hours, the reaction mixture was allowed to cool, then poured onto 0.5 M HCl (200 mL) and extracted into EtOAc. The organic phase was washed with water, then brine, dried (Na2SO4) and concentrated in vacuo. The resulting residue was purified by silica gel chromatography eluting with a gradient of 20-30% EtOAc in cyclohexane Appropriate fractions were combined and concentrated in vacuo to yield the title compound as a white foam (3.7 g).

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