Sodium hydride → 8-bromo-3-methyl-3,7-dihydro-1H-purine-2,6-dione

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Reaction Steps

To a stirring suspension of 7-benzyl-8-bromo-3-methylxanthine (10.06 g, 30.0 mmol) in anhydrous dimethylsulfoxide was added sodium hydride (864 mg, 36.0 mmol). After stirring at room temperature for 30 min, (R)-5-acetoxy-1-chlorohexane (5.9 g, 33.0 mmol) was added. After stirring at 70-75° C. for 12 hours, the mixture was cooled to room temperature, quenched with water (600 ml) and stirred at room temperature for 4 hours. The precipitate was filtered to provide (R)-1-(5-Acetoxyhexyl)-7-benzy)-8-bromo-3-methylxanthine (12.31 g, 86% yield) as a beige powder.

Provenance & Evidence