Triphenylphosphine → HCID 18647640, compound

Participants

Reaction Steps

To a solution of 0.77 g (5.0 mmol) of 6-chloro-purine in 50 ml of tetrahydrofuran was added 1.31 g (5.0 mmol) of triphenylphosphine and 0.87 g (5.0 mmol) of diethyl azodicarboxylate. To this solution was added a solution of 1.99 g (5.0 mmol) of 3,5-bis(t-butyldimethylsiloxy)-1-hydroxy-2-desoxy-2,2-difluororibose in tetrahydrofuran. The reaction mixture was stirred at room temperature for approximately 60 hours and an additional 0.66 g (1.7 mmol) of 3,5-bis(t-butyldimethylsiloxy)-1-hydroxy-2-desoxy-2,2-difluororibose was added to the reaction mixture. The mixture was stirred for an additional 6 hours at room temperature. The solvent was evaporated under vacuum and the residue was stirred in a small amount of diethyl ether overnight. The precipitated solid was removed by vacuum filtration and the filtrate was concentrated under vacuum to dryness. The residue was chromatographed over 70 g of silica and eluted with chloroform. Fractions containing the major component were combined and the solvent was evaporated therefrom to provide 1.0 g of 1-(6-chloro-9H-purin-9-yl)-3,5-bis(t-butyldimethylsiloxy)-2-desoxy-2,2-difluororibose. The structure of the product was verified by NMR. Mass spec.=477 [534-(t-butyl)]

Provenance & Evidence