Acetic Acid → 1-(11-Acetoxy-12-bromododecyl)-3,7-dimethylxanthine

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Reaction Steps

1-(11,12-Dihydroxydodecyl)-3,7-dimethylxanthine (2.50 g, 6.58 mmol) was stirred with hydrogen bromide (6.39 mL of a 30% solution in acetic acid, 19.73 mmol) for 2 hours. The mixture was then added over 10 minutes to water (25 mL), ice (30 g) and sodium hydride CO3 (15 g) and stirred for 30 minutes. The reaction mixture was extracted with dichloromethane (3×50 mL), and the combined organic phases were dried using magnesium sulfate and evaporated to obtain 3.18 g (99% yield) of 1-(11-acetoxy-12-bromododecyl)-3,7-dimethylxanthine. Without further purification, this crude product was taken up in methanol (10 mL) and treated with a solution of sodium methoxide (prepared from sodium, 0.160 g, 6.90 mmol, and 20 mL methanol). After 60 minutes, the reaction was added to water (30 mL) and extracted with dichloromethane (3×50 mL). The organic portions were combined, dried and evaporated to yield 2.20 g (93% yield) 1-(11,12-oxidododecyl)-3,7-dimethylxanthine as a white solid.

Provenance & Evidence