Abstract
Nucleophilic substitution reaction of 6-chloro-2-fluoro-9-beta-D-ribofuranosyl-9H-purine derivative, prepared from guanosine, with potassium [15N]phthalimide at 40 degrees C for 9 h in DMF, followed by hydrolysis, afforded [2-(15)N]guanosine derivative efficiently. The corresponding 2'-deoxy derivative was also synthesized through a similar procedure.
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