Acetic Anhydride → 1,3-Dimethyl-7-(6-hydroxyhexyl)-xanthine

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Reaction Steps

3.4 g of 1,3-dimethyl-7-(6-bromohexyl)-xanthine are boiled overnight under reflux in 50 ml of glacial acetic acid to which 1 ml of acetic anhydride and 5 g of potassium acetate have been added. After evaporation of the solvent by distillation in vacuo the residue is dissolved in 50 ml of 5% sulfuric acid on the addition of 20 ml methanol. The solution is boiled under reflux for 1 hour. The mixture is extracted with chloroform. The chloroform phase is washed until it is neutral and concentrated in vacuo. 1,3-dimethyl-7-(6-hydroxyhexyl)-xanthine having a melting point of 80° C. is obtained in a yield of more than 90%.

Provenance & Evidence