N3-benzoyl-2'-deoxy-3'-O-benzyl-5-fluorouridine 、 (+/-)-5-chloro-4-hydroxy-1-(2-tetrahydrofuryl)-2-pyridone 以46%的产率得到3-benzoyl-3'-O-benzyl-5'-O-[3-[5-chloro-1,2-dihydro-2-oxo-1-(2-tetrahydrofuranyl)-4-pyridyloxycarbonyl]benzoyl]-2'-deoxy-5-fluorouridine