反应详情

1,3-Di-n-butyl-8-bromo xanthine (2 g, 0.0029 mol) was dissolved in toluene (50 ml). After addition of piperidine (5 g, 0.0058 mol) the mixture was refluxed for 9 hours. The reaction mixture was then extracted with water (4×30 ml), the organic layer dried over anhydrous sodium sulphate and the solvent removed in vacuo. The residue was recrystallised from ethanol to give the title product, yield 0.4 g (20%), m.pt. 221° C.

1. temperaturewas refluxed for 9 hours
2. extractionThe reaction mixture was then extracted with water (4×30 ml)
3. dry with materialthe organic layer dried over anhydrous sodium sulphate
4. customthe solvent removed in vacuo
5. customThe residue was recrystallised from ethanol