反应详情

A solution of 1-(8-nonenyl)-3,7-dimethylxanthine (810 mg, 2.7 mmol), prepared above, 4-methylmorpholine-N-oxide (340 mg, 2.9 mmol) and 3 drops of 2.5% osmium tetroxide in t-butanol, acetone (20 ml) and water (20 ml) was stirred for 24 hours, followed by addition of saturated aqueous sodium dithionite solution (5 ml). After stirring the resulting mixture for 15 minutes, the reaction mixture was extracted with four 50 ml aliquots of 25% ethanol-dichloromethane. The combined organic layers were dried over sodium sulfate, and the solvent evaporated under vacuum. A resulting solid residue was recrystallized in ethanol-chloroform, producing 490 mg of 1-(8,9-dihydroxynonyl)-3,7-dimethylxanthine (54% yield).

1. stirringAfter stirring the resulting mixture for 15 minutes
2. extractionthe reaction mixture was extracted with four 50 ml aliquots of 25% ethanol-dichloromethane
3. dry with materialThe combined organic layers were dried over sodium sulfate
4. customthe solvent evaporated under vacuum
5. customA resulting solid residue was recrystallized in ethanol-chloroform