Method for preparing radiolabeled thymidine
   
   

The invention is a novel method and precursor for preparing radiolabeled nucleosides. In particular, the invention is useful for preparing 3'-[.sup.18F]fluorothymidine. The method uses an enol group that is attached to the 2-position on the pyrimidine ring. The enol group attenuates thymidines activity so that the thymidine is easily radiolabeled in short number of steps with good yield.

 
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