Mild fluorination of uracil derivatives by caesium fluoroxysulphate
作者:Stojan Stavber、Marko Zupan
DOI:10.1016/s0040-4020(01)88400-3
日期:1990.1
3-dimethyl-5-halo substituted uracil derivatives reacted with CsSO4F under mild reaction conditions. Reactions carried out in an acetonitrile/water mixture or in a wide range of alcohols (methanol, ethanol, isopropanol and tert.butanol) resulted in the regioselective formation of the 5-fluoro-6-hydroxy or 5-fluoro-6-alkoxy-1,3-dimethyl-5,6-dihydrouracil derivatives, respectively, while the stereochemistry
Regio and stereospecificity of solvent photoaddition to 5-fluorouracil and 1,3-dimethyl-5-fluorouracil
作者:N. Zupančič、M. Zupan、B. Šket
DOI:10.1016/s0022-1139(00)85556-6
日期:1983.11
3-dimethyl-5-fluorouracil in methanol, ethanol, water, and acetic acid, and 5-fluorouracil in water at 253.7nm resulted in the formation of two addition products. Regiospecifity was in all cases the same, with functionalization at position 6, while the stereochemistry of addition depended on the solvent. In water preferential trans addition proceeded, while in acetic acid cis addition was predominant. Photoconversion