反应详情

A mixture of (R)-1-(5-acetoxyhexyl)-7-ethoxymethyl-8-(2-hydroxyethylamino)-3-methylxanthine (3.95 g, 9.3 mmol) and thionyl chloride (25 ml) was stirred at room temperature for 3 hours. After concentrating under reduced pressure to remove unreacted thionyl chloride, ethanol (100 ml) and a 1.0 M solution of hydrogen chloride in diethyl ether (10.0 ml) were added. After the mixture was stirred at 75-80° C. for 16 hours, concentrating under reduced pressure provided (R)-1-(5-hydroxyhexyl)-8-(2-chloroethylamino)-3-methylxanthine (2.2 g, 69% yield) as a white powder.

1. concentrationAfter concentrating under reduced pressure
2. customto remove unreacted thionyl chloride, ethanol (100 ml)
3. additiona 1.0 M solution of hydrogen chloride in diethyl ether (10.0 ml) were added
4. stirringAfter the mixture was stirred at 75-80° C. for 16 hours
5. concentrationconcentrating under reduced pressure