反应详情

A solution of N-(1-benzyl-4-piperidinyl)-6-[(2,2-diphenylethyl)amino]-9-{(2R,3R,4S,5S)-5-[(ethylamino)carbonyl]-3,4-dihydroxytetrahydro-2-furanyl}-9H-purine-2-carboxamide (Preparation 33) (1.03 g, 1.47 mmol), palladium (II) hydroxide (0.9 g) and ammonium formate (0.46 g, 7.3 mmol) in ethanol (10 ml) was heated under reflux for 3 hours. The catalyst was removed by filtration through Arbocel (trade mark), solvent removed by evaporation under reduced pressure and the residue purified by column chromatography on silica gel eluting with a gradient system of dichioromethane:methanol:concentrated aqueous ammonia (90:10:1, by volume) changing to dichloromethane:methanol:concentrated aqueous ammonia (80:20:2, by volume). After evaporation of appropriate fractions the target compound was obtained as a white solid, (0.6 g, 67%).

1. temperatureunder reflux for 3 hours
2. customThe catalyst was removed by filtration through Arbocel (trade mark), solvent
3. customremoved by evaporation under reduced pressure
4. customthe residue purified by column chromatography on silica gel eluting with a gradient system of dichioromethane
5. customAfter evaporation of appropriate fractions the target compound
6. customwas obtained as a white solid, (0.6 g, 67%)