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In an atmosphere of argon gas, 60% sodium hydride (20 mg, 0.65 mole) was added to a suspension of adenine (202.5 mg, 1.34 mmoles) in anhydrous DMF (10 ml). After stirring the mixture at room temperature for one hour, (3S,4S)-3,4-bis(benzoyloxymethyl)-7-oxabicyclo-[4.1.0]heptane (245 mg, 0.67 mmole) was added and the resulting mixture was heated in an oil bath kept at 140° C. for 3 hours. After adding 0.2M phosphate buffer (pH 7.0) to the reaction mixture and stirring the mixture for a while, the mixture was subjected to extraction with ethyl acetate. After drying the extract solution on anhydrous sodium sulfate, the solvent was distilled off under reduced pressure, and the residue was purified by silica gel column chromatography (methylene chloride:methanol=50:1, v/v) to obtain 9-[(1R,2R,4S,5S)-4,5-bis(benzoyloxymethyl)-2-hydroxycyclohexyl]-adenine (161 mg, Yield 48%).

1. temperaturethe resulting mixture was heated in an oil bath
2. waitkept at 140° C. for 3 hours
3. stirringstirring the mixture for a while
4. extractionthe mixture was subjected to extraction with ethyl acetate
5. dry with materialAfter drying the extract solution on anhydrous sodium sulfate
6. distillationthe solvent was distilled off under reduced pressure
7. customthe residue was purified by silica gel column chromatography (methylene chloride