Dicyclohexylcarbodiimide → HCID 136335121, compound

Participants

Reaction Steps

A mixture of 2′,3′-dideoxy-3′-fluoroguanosine (2.15 g, 8 mmole), 2,3-bis-(N-CBZ-L-valyloxy)-propanoic acid (6.2 g, 10.8 mmole), DMAP (244 mg, 2 mmole) and HOBT (1.46 g, 10.8 mmole) was coevaporated two times with DMF and reduced to about 120 ml. DCC (2.48 g, 12 mmole) was added and the mixture was stirred for two days at room temperature. The mixture was filtered and the solution was evaporated under reduced pressure. 150 ml ethyl acetate was added and the organic phase was washed twice with 5% acetic acid, with 5% sodium hydrogen carbonate and with water. The organic phase was dried with sodium sulfate and evaporated under reduced pressure. The product was isolated by silica gel column chromatography. Yield: 2,25 g=35%

Provenance & Evidence