反应详情

A solution of 6-[(2,2-diphenylethyl)amino]-9-{(2R,3R,4S,5S)-5-[(ethylamino)carbonyl]-3,4-dihydroxytetrahydro-2-furanyl}-9H-purine-2-carboxylic acid (Preparation 39) (0.2 g, 0.38 mmol), 2,2,2-trifluoro-N-(4-piperidinyl)acetamide (83 mg, 0.42 mmol) and 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (81 mg, 0.42 mmol) in dichloromethane (5 ml) was stirred at room temperature for 48 hours and then heated under reflux for a further 96 hours. The solution was allowed to cool to room temperature and then solvent removed by evaporation under reduced pressure. The residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane:methanol:concentrated aqueous ammonia (95:5:1, by volume) changing to dichloromethane:methanol:concentrated aqueous ammonia (80:20:1, by volume). After evaporation of appropriate fractions the target compound was obtained as a white solid, (43 mg, 18%).

1. temperatureheated
2. temperatureunder reflux for a further 96 hours
3. customsolvent removed by evaporation under reduced pressure
4. customThe residue was purified by column chromatography on silica gel eluting with a gradient system of dichloromethane
5. customAfter evaporation of appropriate fractions the target compound
6. customwas obtained as a white solid, (43 mg, 18%)