S. Kozai et al., A NEW METHOD FOR THE SYNTHESIS OF N-3-ALKYLATED ANALOGS OF 5-FLUOROURACIL, Journal of the Chemical Society. Perkin transactions. I (Print), (19), 1998, pp. 3145-3146
5-Fluorouracil has been converted to 5-chloro-5-fluoro-6-methoxy-5, 6-
dihydrouracil 1. Compound 1 was condensed with alcohols using a Mitsun
obu reaction to give N-3-alkylated products 2a,b, which were hydrogena
ted in the presence of palladium on activated carbon to afford N-3-alk
yl-5-fluorouracils 3a,b.