1-[3-(4,4'-dimethoxytrityloxy)methyl-4-carbomethoxy-2-oxabutyl]-4-N-benzoylcytosine 、
5'-(methylamino)-5'-deoxythymidine 在
吡啶 、
N,N'-二环己基碳二亚胺 作用下,
反应 12.0h,
以26%的产率得到2-[2-(4-N-benzoylcytosin-1-yl)methoxy-3-(4,4'-dimethoxytrityloxy)propoxy]-N-(5'-deoxythymidin-5'-yl)-N-methylacetamide