二碳酸二叔丁酯 、
1-(2'-O-acetyl-5'-O-benzoyl-3'-C-cyano-3'-O-mesyl-β-D-ribofuranosyl)thymine 以
吡啶 、
二氯甲烷 为溶剂,
以85%的产率得到tert-butyl 3-((2R,3R,4R,5R)-3-acetoxy-5-((benzoyloxy)methyl)-4-cyano-4-((methylsulfonyl)oxy)tetrahydrofuran-2-yl)-5-methyl-2,6-dioxo-3,6-dihydropyrimidine-1(2H)-carboxylate