158798-73-3

5-Deoxy-5-fluoro-N4-((n-pentyloxy)carbonyl)cytidine may be prepared according to US Patent No. 6,114,520.
From 2',3'-bis-O-(tert-butyldimethylsilyl)-5'-deoxy-5-fluorocytidine and n-pentylchloroformate in dichloromethane and pyridine may be obtained 2',3'- bis-O-(tert-butyldimethylsilyl)-5'-deoxy-5-fluoro-N4-((pentyloxy)carbonyl) cytidine.From 2',3'-bis-O-(tert-butyldimethylsilyl)-5'-deoxy-5-fluoro-N4- ((pentyloxy)carbonyl)cytidineand tetrabutylammonium fluoride in tetrahydrofuran at room temperature for 2 hours may be prepared the product which by hydrolyses may be converted to 5-deoxy-5-fluoro-N4- ((pentyloxy)carbonyl)cytidine. Purification of the product may be carried out by silica gel chromatography (using dichloromethane:methanol = 20:1 as an eluent).