1-[(1R,3R,4S,7R)-7-hydroxy-1-(hydroxymethyl)-7-methyl-2,5-dioxabicyclo[2.2.1]heptan-3-yl]pyrimidine-2,4-dione 在
吡啶 、
N-甲基咪唑 作用下,
以
二氯甲烷 为溶剂,
生成 (1S,3R,4S,7R)-1-((bis(4-methoxyphenyl)(phenyl)methoxy)methyl)-3-(2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)-7-methyl-2,5-dioxabicyclo[2.2.1]heptan-7-yl (2-cyanoethyl) diisopropylphosphoramidite