反应详情

n-Butyl nitrite (4.65 ml, 39.7 mmol) was added to a suspension of (2R,3R,4S,5S)-2-(2-amino-6-chloro-9H-purin-9-yl)-4-(benzoyloxy)-5-[(ethylamino)carbonyl]-tetrahydro-3-furanyl benzoate (Preparation 46) (8.10 g, 14.7 mmol), iodine (3.73 g, 14.7 mmol), copper(1) iodide (6.16 g, 32.3 mmol) and diiodomethane (12.55 ml, 155.8 mmol) in THF (100 ml) and the mixture was heated under reflux for 2.5 hours. The solution was allowed to cool to room temperature and the solvent was removed under reduced pressure. The residue was partitioned between aqueous sodium metabisulfite solution (5% w/v, 100 ml) and dichloromethane (100 ml). The organic layer was separated, filtered through Arbocel (trade mark), dried over anhydrous magnesium sulfate and solvent evaporated under reduced pressure. The residue was purified by column chromatography on silica gel eluting with dichloromethane:methanol (99:1, by volume) to afford the title compound as a yellow foam (7.55 g, 78%).

1. temperaturethe mixture was heated
2. temperatureunder reflux for 2.5 hours
3. customthe solvent was removed under reduced pressure
4. customThe residue was partitioned between aqueous sodium metabisulfite solution (5% w/v, 100 ml) and dichloromethane (100 ml)
5. customThe organic layer was separated
6. filtrationfiltered through Arbocel (trade mark)
7. dry with materialdried over anhydrous magnesium sulfate and solvent
8. customevaporated under reduced pressure
9. customThe residue was purified by column chromatography on silica gel eluting with dichloromethane:methanol (99:1, by volume)