8-(chloromethyl)-5'-O-[dimethyl(1,1,2-trimethylpropyl)silyl]-2',3'-O-isopropylidene-β-D-ribofuranosyl-9H-purine 、
5'-S-acetyl-2',3'-O-isopropylidene-5'-thiouridine 在
sodium methylate 作用下,
以
甲醇 为溶剂,
以98%的产率得到5'-O-[dimethyl(1,1,2-trimethylpropyl)silyl]-2',3'-O-isopropylidene-β-D-ribofuranosyl-9H-purine-8-methyl-(8(1)->5'-S)-2',3'-O-isopropylidene-5'-thiouridine