Formic Acid → HCID 88430022, compound

Participants

Reaction Conditions

Reaction Steps

To ice cooled acetic anhydride (0.57 ml) was added dropwise 99% formic acid (286 μl). The solution was stirred for 15 minutes at 0° C. and for 50 minutes at 50° C., and then cooled to 0° C. To the solution was added 2',3'-bis-O-(tert-butyldimethylsilyl)-5'-deoxy-5-fluorocytidine (473 mg) obtained in Reference example (a) in dry pyridine (5 ml) at 0° C. The reaction mixture was stirred for 10 minutes at 0° C. and for 26 hours at room temperature. After removal of the solvent under reduced pressure the residue was partitioned between water and ethyl acetate. The organic layer was washed with saturated sodium hydrogen carbonate solution and water, and dried over anhydrous sodium sulfate. Ethyl acetate was evaporated under reduced pressure and the residue was purified by silica gel column chromatography (n-hexane - ethyl acetate) followed by recrystallization from n-hexane - ethyl acetate to give 144 mg of 2',3'-bis-O-(tert-butyldimethylsilyl)-5 '-deoxy-5-fluoro-N4 -formylcytidine, mp 188° C. (dec.); MS 502 (MH+).

Provenance & Evidence