5'-O-(4,4'-dimethoxytrityl)-3'-O-(t-butyldimethylsilyl)-2'-deoxythymidine 、 7-iodoheptyl phenoxyacetate 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以
乙腈 为溶剂,
以80%的产率得到Phenoxy-acetic acid 7-{3-[(2R,4S,5R)-5-[bis-(4-methoxy-phenyl)-phenyl-methoxymethyl]-4-(tert-butyl-dimethyl-silanyloxy)-tetrahydro-furan-2-yl]-5-methyl-2,6-dioxo-3,6-dihydro-2H-pyrimidin-1-yl}-heptyl ester