Trifluoroacetic acid → HCID 54113892, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 3-(3,5-dimethoxy-phenyl)-1-ethyl-7-methanesulfinyl-3,4-dihydro-pyrimido[4,5-d]pyrimidin-2(1H)-one (0.5 g, 1.33 mmol), 4-(2-diethylaminoethoxy)aniline (0.55 g, 2.66 mmol, Helv. Chim. Acta, 1960; 43:1971-1979) and trifluoroacetic acid (0.46 g, 3.98 mmol) in acetonitrile (6 mL) was heated in a sealed tube at 100° C. for 18 hours. The solvent was removed under reduced pressure and the residue dissolved in water. The solution was made basic with 1N NaOH and extracted twice with EtOAc. The combined organic layers were dried over magnesium sulfate, filtered, and evaporated. The residue was suspended in ether (20 mL), triethylamine (0.27 g, 2.66 mmol), and BOC2O (0.32 g, 1.46 mmol) added, and the mixture stirred at ambient temperature for 4 hours. The reaction mixture was diluted with hexane and cooled to 0° C. The insoluble product was collected by filtration and washed with hexane to afford 0.56 g (81%) of the titled compound: mp 139-141° C. Mass Spectrum (APCI, 80/20 CH3CN/H2O, Probe=450° C.) (m+1)/z 521.3

Provenance & Evidence