(1R,2R,3R,4R)-3-Fluoro-4-[6-methoxy-2-(trityl-amino)-purin-9-yl]-2-trityloxy-1-trityloxymethyl-cyclopentanol 在
4-二甲氨基吡啶 、
三氯氧磷 作用下,
以
二氯甲烷 为溶剂,
以88%的产率得到[9-((1R,4R,5R)-5-Fluoro-4-trityloxy-3-trityloxymethyl-cyclopent-2-enyl)-6-methoxy-9H-purin-2-yl]-trityl-amine