Hydrochloric Acid → HCID 15886850, compound

Participants

Reaction Steps

3.17 g (28.2 mM) of potassium t-butoxide (t-BuOK) were added to a solution of 6.11 g (27.5 mM) of 6-amino-1-ethyl-5-isobutyrylamino-uracil. At 0° C., 4.90 g (30.4 mM) of 4-chlorobenzylchloride were added. After 3 hr at 0-5° C., further 1.22 g t-BuOK and 2.45 g of 4-chloro-benzylchloride were added. After further 3 hr another 2.45 g of benzylchloride are supplemented. After 3 days (1 day is sufficient) the solution was neutralized with 1N HCl and the solvents evaporated. The residue was suspended in water, the solid collected and washed. The crude intermediate amide was heated under reflux in 100 ml of 1N NaOH and 10 ml of 1-propanol. After 1 hr the mixture was neutralized to pH 7 and extracted with chloroform. Crystallization from dichloromethane (mainly evaporated)--methanol gave 2.99 g (31.3%) of the title xanthine, mp 194-5° C. The mother liquors gave 6.33 g of impure material which was separated on 15 g of silica gel elutions with dichloromethane and gave additional 0.78 g (8.2%) of the xanthine.

Provenance & Evidence