Abstract
8,3′-Anhydro-8-mercapto-9-β-D-xylofuranosyladenine (8,3′-s-cycloadenosine) was phosphorylated with cyanoethyl phosphate and DCC to 5′-phosphate. After 6-amino group was benzoylated, the monophosphate was treated with DCC to give a cyclic phosphate (II). The structure of compound II was elucidated as 8,3′-s-cycloadenosine 2′,5′-cyclic phosphate by UV, NMR and CD spectra, as well as enzymatic hydrolyses. When compound II was desulfurized with Raney nickel, cordycepin 2′,5′-cyclic phosphate (III) was obtained. Although compound III could be obtained from cordycepin 5′-phosphate with DCC, the yield was extremely low.
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