Synthesis of Analogues of Ribosylbarbituric Acid

Abstract
Syntheses of 5-alkyl (5 b,c), 2''-deoxyribosyl (9, 10) and arabinofuranosyl (13) analogues of ribosylbarbituric acid (5a) are described. The compounds were prepared by condensation of persilylated barbituric acid with pentofuranosyl moieties. The 2''-tolylthio analogue (16) was obtained by an alternative procedure involving ring-opening of 6,2''-O-cyclouridine (15).