反应详情

10.0 g of 2'-deoxy-3',5'-di-O-acetyl-5-fluorouridine and 10 ml of triethylamine were dissolved in 50 ml of dioxane, and the resulting mixture was cooled with ice. To the mixture was added 7.0 g of 2-methylbenzoyl chloride, and the resulting mixture was allowed to stand at room temperature for 30 minutes and then at 45° C. for 60 minutes. The crystals formed were filtered off, and the filtrate was concentrated under reduced pressure. The thus obtained oily residue was dissolved in 50 ml of ethanol by application of heat. After being cooled, the solution was inoculated, and there was obtained 2'-deoxy-3',5'-di-O-acetyl-5-fluoro-3-(2-methylbenzoyl)-uridine) as crystals. Recrystallization of the product from ethanol afforded 11.3% (yield: 84.0%) of colorless prismatic crystals having a melting point of 108° to 109° C. The structure of the product was supported by the absorption spectra and elemental analysis.

1. temperaturethe resulting mixture was cooled with ice
2. waitat 45° C. for 60 minutes
3. customThe crystals formed
4. filtrationwere filtered off
5. concentrationthe filtrate was concentrated under reduced pressure
6. dissolutionThe thus obtained oily residue was dissolved in 50 ml of ethanol by application
7. temperatureof heat
8. temperatureAfter being cooled