反应详情

Benzylisocyanate (26 mg, 0.30 mmol) was added to a solution of (2S,3S,4R,5R)-5-{2-(aminomethyl)-6-[(2,2-diphenylethyl)amino]-9H-purin-9-yl}-N-ethyl-3,4-dihydroxytetrahydro-2-furancarboxamide (Preparation 11) in dichloromethane (2 ml). The reaction mixture was stirred for 16 hours at room temperature and allowed to evaporate. Ethanol (2 ml) was added and then aqueous hydrochloric acid (1M, 1 ml) was added. The reaction mixture was stirred at 60° C. for 6 hours, then allowed to cool to room temperature and left for a further 16 h. More aqueous hydrochloric acid (1 M, 0.5 ml) was added and the reaction mixture was stirred at room temperature for a further 4 h. The solvent was removed under reduced pressure and the residue was purified by column chromatography on silica gel eluting with dichloromethane: methanol (95:5 by volume) increasing in polarity to dichloromethane:methanol (90:10 by volume). The material obtained was impure and hence was repurified by column chromatography on silica gel eluting with dichloromethane:methanol (95:5 by volume) increasing in polarity to dichloromethane:methanol (90:10 by volume) to give the title compound as a solid (85 mg).

1. customto evaporate
2. additionEthanol (2 ml) was added
3. additionaqueous hydrochloric acid (1M, 1 ml) was added
4. stirringThe reaction mixture was stirred at 60° C. for 6 hours
5. temperatureto cool to room temperature
6. waitleft for a further 16 h
7. additionMore aqueous hydrochloric acid (1 M, 0.5 ml) was added
8. stirringthe reaction mixture was stirred at room temperature for a further 4 h
9. customThe solvent was removed under reduced pressure
10. customthe residue was purified by column chromatography on silica gel eluting with dichloromethane: methanol (95:5 by volume)
11. temperatureincreasing in polarity to dichloromethane:methanol (90:10 by volume)
12. customThe material obtained
13. customhence was repurified by column chromatography on silica gel eluting with dichloromethane:methanol (95:5 by volume)
14. temperatureincreasing in polarity to dichloromethane:methanol (90:10 by volume)