3-(methanesulfonyloxy)-2-(2',3'-O-isopropylidene-5'-O-trityl-D-ribofuranosyl)acrylonitrile 、
巯基乙酸乙酯 在
1,5-二氮杂双环[4.3.0]壬-5-烯 作用下,
以
氯仿 为溶剂,
生成
[(E)-2-Cyano-2-((3aS,6R,6aR)-2,2-dimethyl-6-trityloxymethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-vinylsulfanyl]-acetic acid ethyl ester 、 [2-Cyano-2-((3aS,6R,6aR)-2,2-dimethyl-6-trityloxymethyl-tetrahydro-furo[3,4-d][1,3]dioxol-4-yl)-1-ethoxycarbonylmethylsulfanyl-ethylsulfanyl]-acetic acid ethyl ester