Unsaturated dideoxy fluoro-ketopyranosyl nucleosides as new cytostatic agents: A convenient synthesis of 2,6-dideoxy-3-fluoro-4-keto-β-d-glucopyranosyl analogues of uracil, 5-fluorouracil, thymine, N4-benzoyl cytosine and N6-benzoyl adenine
acetylated dideoxy analogues of uracil (8a), 5-fluorouracil (8b), thymine (8c), N4-benzoyl cytosine (8d) and N6-benzoyl adenine (8e), respectively. Finally, direct oxidation of the free hydroxyl group at the 4′-position of 8a–e, and simultaneous elimination reaction of the β-acetoxyl group, afforded the desired unsaturated 2,6-dideoxy-3-fluoro-4-keto-β-d-glucopyranosyl derivatives 9a–e. The new analogues were