反应详情

A mixture of 2′,3′-dideoxy-3′-fluoroguanosine (17.8 g, 66 mmole), HOBT (10.64 g, 78.8 mmole), succinic acid 1,3-bis-(N-CBZ-L-valyloxy)-2-propyl ester (52 g, 78.8 mmole) and DMAP (0.96 g, 7.88 mmole) was coevaporated two times with DMF and redued to about 500 ml. DCC (17.3 g, 84 mmole) was added and the mixture was stirred overnight at room temperature. The mixture was warmed for six hours at 60° C. and then cooled to about 10° C. The mixture was filtered and the solution was reduced under reduced pressure. 1200 ml of ethyl acetate was added and the organic phase was washed twice with 5% acetic acid, 5% sodium hydrogen carbonate and water. The organic phase was dried with sodium sulfate and evaporated under reduced pressure. The product was isolated by silica gel column chromatography.

1. temperatureThe mixture was warmed for six hours at 60° C.
2. temperaturecooled to about 10° C
3. filtrationThe mixture was filtered
4. addition1200 ml of ethyl acetate was added
5. washthe organic phase was washed twice with 5% acetic acid, 5% sodium hydrogen carbonate and water
6. dry with materialThe organic phase was dried with sodium sulfate
7. customevaporated under reduced pressure
8. customThe product was isolated by silica gel column chromatography