Water → 1-(9-Octadecenyl)-3,7-dimethylxanthine

Temperature

60 °C

Sodium hydride (95%, 84 mg, 3.5 mmol) was added to a solution of theobromine (0.595 g, 3.2 mmol) in dimethylsulfoxide (15 ml). After 20 minutes of stirring, 1-bromo-9-octadecene (0.995 g, 3 mmol), prepared above, was added. After 6 hours of stirring at room temperature, the reaction mixture was warmed to 60° C. over 3 hours and then poured into a separatory funnel containing 50 ml of water. The reaction mixture was extracted with five 40 ml aliquots of dichloromethane. The organic extracts were combined, washed with water (50 ml) and brine (50 ml) and dried over anhydrous magnesium sulfate. Removing the solvent under reduced pressure resulted in a crude product further purified by flash chromatography over silica gel using a 30% acetone/petroleum ether eluant, yielding 0.44 g of 1-(9-octadecenyl)-3,7-dimethylxanthine (34% yield).

1. additionwas added
2. stirringAfter 6 hours of stirring at room temperature
3. additionpoured into a separatory funnel
4. extractionThe reaction mixture was extracted with five 40 ml aliquots of dichloromethane
5. washwashed with water (50 ml) and brine (50 ml)
6. dry with materialdried over anhydrous magnesium sulfate
7. customRemoving the solvent under reduced pressure
8. customresulted in a crude product
9. customfurther purified by flash chromatography over silica gel using a 30% acetone/petroleum ether eluant

ORD record

ord-835f5f6191cb49a5aa6d5bc1f57a77ed

Source dataset

uspto-grants-2000_08

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06100271