Hydrochloric Acid → Cytidine, 5′-deoxy-5-fluoro-N-(propoxycarbonyl)-

Participants

Reaction Steps

To a solution of 2',3'-di-O-acetyl-5'-deoxy-5-fluoro-N4 -(propoxycarbonyl)cytidine (2.5 g) in CH2Cl2 (17 ml) was added dropwise 1N NaOH (17 ml) with stirring and cooling with ice bath. After stirring for 1 hr at 0° C., MeOH (0.9 ml) was added to the mixture. And pH of the reaction mixture was adjusted to 6 by the addition of concentrated HCl and partitioned. The aqueous layer was extracted with a mixed solvent of CH2Cl2 /MeOH(95/5) successively (40 ml×10). The combined organic layers were dried over anhydrous sodium sulfate and filtered. The solution was evaporated, and the residue was crystallized from ethyl acetate to give 5'-deoxy-5-fluoro-N4 -(propoxycarbonyl)cytidine as colorless crystals (1.6 g, y. 79.8%): mp. 125°-126.5° C.; EI-MS m/z 331 (M+).

Provenance & Evidence