Potassium Carbonate → 5-Bromo-2-{1-[4-(4-methoxy-benzenesulfonyl)-piperazin-1-yl]-ethyl}-3H-pyrimidin-4-one

In a round bottom flask containing 5-bromo-2-(1-bromo-ethyl)-3H-pyrimidin-4-one (1.0 g, 3.5 mmol) in acetonitrile (30 ml) was added KI (0.9 g, 5.3 mmol), K2CO3 (1.2 g, 5.3 mmol), and (1-(4-Methoxy-benzenesulfonyl)-piperazine (983 mg, 3.5 mmol). The reaction was heated at reflux for 12 hours. The solution was concentrated under reduced pressure. The residue was partitioned between water (10 ml) and dichloromethane (15 ml). The organic layer was dried over magnesium sulfate, filtered and concentrated under reduced pressure. The solvent was removed under vacuum. The resulting residue purified by column chromatography (ethyl acetate: hexanes 1:1) to give 5-bromo-2-{1-[4-(4-methoxy-benzenesulfonyl)-piperazin-1-yl]-ethyl}-3H-pyrimidin-4-one (Yield 854 mg, 53%). 1H NMR (400 MHz, CDCl3): δ 1.28 (d, J=7.0 Hz, 3H), 2.62-2.49 (m, 4H), 3.00-2.94 (m, 4H), 3.84 (s, 3H), 4.05 (q, 1H, J=7.0 Hz), 6.97 (d, J=11.8 Hz, 2H), 7.62 (d, J=11.8 Hz, 2H), 8.11 (s, 1H). MS m/z calc. 457.3, found (ESI); 457.2 (M+1)+. Retention time 2.50 minutes.

1. temperatureThe reaction was heated
2. temperatureat reflux for 12 hours
3. concentrationThe solution was concentrated under reduced pressure
4. customThe residue was partitioned between water (10 ml) and dichloromethane (15 ml)
5. dry with materialThe organic layer was dried over magnesium sulfate
6. filtrationfiltered
7. concentrationconcentrated under reduced pressure
8. customThe solvent was removed under vacuum
9. customThe resulting residue purified by column chromatography (ethyl acetate: hexanes 1:1)

ORD record

ord-b70e1bcfca4c44eaa9412537f2b082da

Source dataset

uspto-grants-2014_02

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08642609B2