(E)-3-[1-((2R,4S,5R)-4-Hydroxy-5-hydroxymethyl-5-methyl-tetrahydro-furan-2-yl)-2,4-dioxo-1,2,3,4-tetrahydro-pyrimidin-5-yl]-acrylic acid 在
N-溴代丁二酰亚胺(NBS) 、
potassium hydrogencarbonate 作用下,
以
N,N-二甲基甲酰胺 为溶剂,
以84%的产率得到5-((E)-2-Bromo-vinyl)-1-((2R,4S,5R)-4-hydroxy-5-hydroxymethyl-5-methyl-tetrahydro-furan-2-yl)-1H-pyrimidine-2,4-dione