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 18) (8.10 g, 14.7 mmol), iodine (3.73 g, 14.7 mmol), copper(I) iodide (6.16 g, 32.3 mmol) and diiodomethane (12.55 ml, 155.8 mmol) in THF (100 ml) and the mixture was heated at 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%, 100 ml) and dichloromethane (100 ml). The organic layer was separated, filtered through arbacel, dried (MgSO4) 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. temperatureat reflux for 2.5 hours
3. customthe solvent was removed under reduced pressure
4. customThe residue was partitioned between aqueous sodium metabisulfite solution (5%, 100 ml) and dichloromethane (100 ml)
5. customThe organic layer was separated
6. filtrationfiltered through arbacel
7. dry with materialdried (MgSO4) 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)