3-Isocyanatobenzonitrile → (+/-)-3-[7-chloro-3-(4-methoxy-phenyl)-4-methyl-2-oxo-3,4-dihydro-2H-pyrimido[4,5-d]pyrimidin-1-yl]-benzonitrile

Temperature

110 °C

To a solution of (±)-[1-(2,4-dichloro-pyrimidin-5-yl)-ethyl]-(4-methoxy-phenyl)-amine (0.10 g; 0.34 mmol) (from Example 1d supra) in toluene (1 mL) was added 3-cyanophenyl isocyanate (66.6 mg; 0.46 mmol) (Aldrich). The mixture was heated in an oil bath at 110° C. for two hours. After cooling to room temperature, the reaction was concentrated under reduced pressure. The residue was triturated with hexanes and dried briefly. The solid residue (intermediate urea) was taken up in freshly distilled tetrahydrofuran (1.5 mL), cooled in an ice-brine bath and treated with potassium tert-butoxide (1.0 M in tetrahydrofuran; 370 μL; 0.37 mmol) (Aldrich). After 15 minutes in the cold the reaction was complete by TLC analysis and was filtered through a silica gel pad (0.5 g) and washed with ethyl acetate. The filtrate was concentrated and the residue was purified by flash chromatography (Biotage, 12M, 40:60 ethyl acetate-hexanes) to give (±)-3-[7-chloro-3-(4-methoxy-phenyl)-4-methyl-2-oxo-3,4-dihydro-2H-pyrimido[4,5-d]pyrimidin-1-yl]-benzonitrile as a solid. (Yield 0.13 g; 85.6%).

1. temperatureAfter cooling to room temperature
2. concentrationthe reaction was concentrated under reduced pressure
3. customThe residue was triturated with hexanes
4. customdried briefly
5. temperaturecooled in an ice-brine bath
6. filtrationwas filtered through a silica gel pad (0.5 g)
7. washwashed with ethyl acetate
8. concentrationThe filtrate was concentrated
9. customthe residue was purified by flash chromatography (Biotage, 12M, 40:60 ethyl acetate-hexanes)

ORD record

ord-46debefc903648019a266deac1a32872

Source dataset

uspto-grants-2006_09

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07112676B2