An alternative synthesis of 3′-deoxy-3′-fluoro-d-ribofuranosyl nucleoside from d-arabinose is disclosed. Inversion of configuration at C3 on d-arabinoside promoted by DAST reagent is utilized to form lyxo-configured furanoside. After a sequence of fluorination, acidic methanolysis, triflation and displacement by OBz. 3′-deoxy-3′-fluoro-d-ribofuranoside is obtained, which is then transformed to 1-O-benzoyl derivative. The synthesis of three 3′-deoxy-3′-fluoro-d-ribofuranosyl nucleosides, which can be served as fragment of antitumor active cyclic dinucleotide is finally completed through Vorbrüggen glycosylation .

中文翻译：

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抗肿瘤活性环状二核苷酸的重要片段3'-脱氧-3'-氟-d-呋喃核苷的替代合成

公开了从d-阿拉伯糖合成 3'-脱氧-3'-氟-d-呋喃核苷的替代方法。由 DAST 试剂促进的d-阿拉伯糖苷的 C3 构型反转用于形成 lyxo-构型的呋喃糖苷。经过一系列氟化、酸性甲醇分解、三氟甲磺酸化和 OBz 置换后。得到3'-脱氧-3'-氟-d-呋喃核糖苷，然后转化为1- O-苯甲酰基衍生物。最终通过Vorbrüggen糖基化完成三个3'-脱氧-3'-氟-d-呋喃核糖核苷的合成，可作为抗肿瘤活性环状二核苷酸的片段。