Bis<2,2,2-tribromoethyl> phosphorochloridate 、
2',3'-O-isopropylidene-5-bromouridine 在
1H-1,2,4-三唑 、
N-甲基咪唑 作用下,
以
吡啶 为溶剂,
以80%的产率得到Phosphoric acid (3aR,4R,6R,6aR)-6-(5-bromo-2,4-dioxo-3,4-dihydro-2H-pyrimidin-1-yl)-2,2-dimethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-ylmethyl ester bis-(2,2,2-tribromo-ethyl) ester