反应详情

A solution of (2R,3R,4R,5R)-4-(acetyloxy)-2-[(acetyloxy)methyl]-5-(6-{[2,2-bis(4-chlorophenyl)ethyl]amino}-2-cyano-9H-purin-9-yl)tetrahydro-3-furanyl acetate (700 mg, 1 mmol) (Preparation 64) in ethanol (20 ml) was saturated with ammonia gas. 10% Palladium on carbon (140 mg) was added and the reaction mixture stirred under an atmosphere of hydrogen gas (414 kPa, 60 psi) at room temperature for 16 hours. The Palladium on carbon was filtered off through Arbocel (Trade Mark) and the filtrate was evaporated under reduced pressure. The residue was dissolved in methanol (50 ml) and sodium carbonate (60 mg, 0.57 mmol) was added. The reaction mixture was stirred for 1.5 hours and then the solvent was removed under reduced pressure. The residue was purified by column chromatography on silica gel eluting with dichloromethane:methanol:0.88 concentrated aqueous ammonia (95:5:0.5 by volume) increasing in polarity to dichloromethane:methanol:0.88 concentrated aqueous ammonia (90:10:2 by volume). The solvent was removed under reduced pressure to give the title compound (275 mg) as a foam.

1. filtrationThe Palladium on carbon was filtered off through Arbocel (Trade Mark)
2. customthe filtrate was evaporated under reduced pressure
3. dissolutionThe residue was dissolved in methanol (50 ml)
4. stirringThe reaction mixture was stirred for 1.5 hours
5. customthe solvent was removed under reduced pressure
6. customThe residue was purified by column chromatography on silica gel eluting with dichloromethane
7. temperaturemethanol:0.88 concentrated aqueous ammonia (95:5:0.5 by volume) increasing in polarity to dichloromethane
8. customThe solvent was removed under reduced pressure