Uracil → 2',3',5'-tri-O-benzoyl-2'-C-methyluridine

Participants

Reaction Conditions

Reaction Steps

Compound 57 may be prepared according to Scheme 7, above. To a solution of uracil (4 g) in acetonitrile (120 ml) was added BSA (18 ml) and the mixture was stirred at 100° C. for 30 minutes. After cooling to room temperature, 1,2,3,5-tetra-O-benzoyl-2-C-methyl-β-D-ribofuranose (10 g) in acetonitrile (120 ml) and 5 nCl4 (7 ml) were added. The reaction mixture was stirred at 100° C. for 4 hours. The mixture was diluted with EtOAc and a saturated solution of NaHCO3 was added at 0° C. followed by filtration on celite. The filtrate was extracted with EtOAc and the organic layer was washed with a saturated solution of NaHCO3. After drying over Na2SO4 and filtration, the organic layer was concentrated under reduced pressure. The residue was purified by silica gel chromatography eluting with 0→20% EtOAc in dichloromethane to yield 2′,3′,5′-tri-O-benzoyl-2′-C-methyluridine (80%). 2′,3′,5′-tri-O-benzoyl-2′-C-methyluridine was characterized by the following spectroscopic data: MS (ESI, EI+) m/z=571.2 (MH+).

Provenance & Evidence