Seven-membered cyclic phosphate: synthesis and properties of S-cycloadenosine 2',5'-cyclic phosphate and cordycepin 2',5'-cyclic phosphate. Studies of nucleosides and nucleotides. LXIV. 1). Purine cyclonucleosides 25.

@article{Ikehara1974SevenmemberedCP,
  title={Seven-membered cyclic phosphate: synthesis and properties of S-cycloadenosine 2',5'-cyclic phosphate and cordycepin 2',5'-cyclic phosphate. Studies of nucleosides and nucleotides. LXIV. 1). Purine cyclonucleosides 25.},
  author={Morio Ikehara and Junichi Yano},
  journal={Nucleic acids research},
  year={1974},
  volume={1 12},
  pages={
          1783-98
        }
}
8,3'-Anhydro-8-mercapto-9-beta-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… 
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