反应详情

0.5 g (1.6 mmol) of 1,3-dipropyl-8-(1-oxo-3-cyclopentyl)xanthine, 10 ml of ethanol and 0.1 g (2.6 mmol) of sodium tetrahydridoboranate are stirred for 21/2 days at ambient temperature. The mixture is evaporated down in vacuo and mixed with water and methylene chloride then the aqueous phase is acidified and extracted. The combined organic extracts are dried and evaporated down in vacuo. The residue is separated into the isomers by chromatography on silica gel (CH2Cl2 /CH3OH 95:5). From the 1st fraction, 0.4 g of the title compound are obtained in the form of white crystals (39% of theory), m.p. 174°-176° C. and from the 2nd fraction 0.4 g of the title compound are obtained in the form of white crystals (39% of theory), m.p. 191°-193° C.

1. customThe mixture is evaporated down in vacuo
2. additionmixed with water and methylene chloride
3. extractionextracted
4. customThe combined organic extracts are dried
5. customevaporated down in vacuo
6. customThe residue is separated into the isomers by chromatography on silica gel (CH2Cl2 /CH3OH 95:5)