Abstract
Nucleophilic substitution of 9-(2,3,5-tri-O-acetyl-beta-D-ribofuranosyl)-6-chloro-2-fluoro-9H-purine, prepared from guanosine, with N-tert-butyldimethylsilyl[(15)N]-phthalimide in the presence of a catalytic amount of CsF at room temperature in DMF efficiently afforded the 6-chloro-2-[(15)N]phthalimidopurine derivative. Treatment of this with sodium 2-cyanoethoxide yielded the [2-(15)N]guanosine derivative. The 2'-deoxy[2-(15)N]guanosine derivative was also efficiently synthesized through a similar procedure.
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