A new synthesis of 3′‐deoxy‐3′‐fluoroadenosine, a key intermediate of cyclic dinucleotide

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AbstractA new synthesis of 3′‐deoxy‐3′‐fluoroadenosine for use as an important intermediate of antitumor‐active cyclic dinucleotide is disclosed. The synthesis started with the known 5‐O‐TBDPS‐D‐lyxofuranose 1,2‐acetonides, which was first transformed into a fluorinated compound after the DAST reaction. Desilylation and acidic methanolysis were then finished in one pot. After a sequence of triflation, displacement by OBz as well as benzoylation, perbenzoylated 3‐deoxy‐3‐fluoro‐D‐ribofuranoside was obtained, which would be transformed to 3′‐deoxy‐3′‐fluoroadenosine as the key intermediate of cyclic dinucleotide after ammonolysis.