反应详情

3-Methyl-7-(methylpivaloyl)xanthine (406 mg, 1.5 mmol) was added to a stirring suspension of NaH (36 mg, 1.5 mmol) in DMSO (20 ml) and stirred for 15 min. 6-Bromo-2-hexanone (260 mg, 1.5 mmol) was added and the reaction mixture was stirred for 20 hrs. The reaction mixture was poured into 100 ml of water and extracted with 25% ethanol/dichloromethane (3×40 ml). The combined organic extracts were combined, dried with magnesium sulfate and the solvent was removed under vacuum to give a brown oil. The brown oil was chromatographed (10 g silica gel, ethyl acetate) to give 1-(5-oxohexyl)-3-methyl-7-(methylpivaloyl)xanthine (270 mg, 49% yield)

1. stirringthe reaction mixture was stirred for 20 hrs
2. extractionextracted with 25% ethanol/dichloromethane (3×40 ml)
3. dry with materialdried with magnesium sulfate
4. customthe solvent was removed under vacuum
5. customto give a brown oil
6. customThe brown oil was chromatographed (10 g silica gel, ethyl acetate)