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9.45 g (0.07 mole) of adenine are added to a solution of 1.6 g (0.07 mole) of sodium in 250 ml of isopropanol and the reaction mixture heated under reflux for 10 minutes. It is then cooled and 21.4 g (0.08 mole) of 3-(4-phenoxymethylpiperidino)-propyl chloride in 50 ml of isopropanol added thereto. After stirring the reaction mixture under reflux for 6 hours, it is evaporated in a vacuum, the residue is taken up in methylene chloride, the methylene chloride solution is washed with 2 N aqueous sodium hydroxide solution and subsequently with water, dried over anhydrous sodium sulfate, evaporated and the residue recrystallized from isopropanol. There are obtained 16.4 g (64% of theory) of 9-[3-(4-phenoxymethylpiperidino)-propyl]-adenine; m.p. 142°-144° C.

1. temperaturethe reaction mixture heated
2. temperatureunder reflux for 10 minutes
3. temperatureIt is then cooled
4. temperatureunder reflux for 6 hours
5. customit is evaporated in a vacuum
6. washthe methylene chloride solution is washed with 2 N aqueous sodium hydroxide solution and subsequently with water
7. dry with materialdried over anhydrous sodium sulfate
8. customevaporated
9. customthe residue recrystallized from isopropanol