5'-O-(p,p'-Dimethoxytrityl)thymidine 3'-(ethyl N,N-diisopropylphosphoroamidite) 、 3'-O-[(1,1-dimethylethyl)diphenylsilyl]-(S)-5'-C-p-toluenesulfonyloxypropylthymidine 在
5-ethylthiotetrazole 作用下,
以
乙腈 为溶剂,
以66%的产率得到ethyl [(5'S)-5'-C-(tosyloxypropyl)-3'-O-(tert-butyldiphenylsilyloxy)thymidine-5'-O-yl][(5'-O-dimethoxytrityl)thymidine-3'O-yl]phosphite