Preparation of 5-[131I]iodo- and 5-[211At]astato-1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl) uracil by a halodestannylation reaction.

Published

Journal Article

To circumvent the in vivo instability of 5-iodo-2'-deoxyuridine (IUdR), a 2'-fluorine-substituted analogue, 5-iodo-1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)uracil (FIAU) recently has been introduced. To facilitate the preparation of radioiodinated FIAU as well as its astatinated analogue, a tin precursor, 5-trimethylstannyl-1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)ura cil (FTAU) was synthesized. Both [125/131I]FIAU and 5-[211At]astato-1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)uracil (FAAU) were prepared from FTAU in more than 85% radiochemical yield under mild conditions. The in vitro serum stability of both fluorine-substituted derivatives was higher than that of the corresponding unsubstituted parents. The enhanced stability of fluorinated derivatives was even more apparent in whole blood. The uptake of [125I]FIAU in D-247 MG human glioma cells in vitro was 20-fold higher than that of [125I]IUdR over an activity concentration range of 5-100 kBq/mL; the uptake of FAAU was not significantly different from that of 5-[211At]astato-2'-deoxyuridine (AUdR). Accumulation of radioiodine in mouse thyroid in vivo with [131I]FIAU was fivefold lower than [125I]IUdR, indicating that the former was less susceptible to deiodination. The tissue uptake of FAAU was similar to that reported for AUdR.

Full Text

Duke Authors

Cited Authors

  • Vaidyanathan, G; Zalutsky, MR

Published Date

  • July 1998

Published In

Volume / Issue

  • 25 / 5

Start / End Page

  • 487 - 496

PubMed ID

  • 9720667

Pubmed Central ID

  • 9720667

International Standard Serial Number (ISSN)

  • 0969-8051

Language

  • eng

Conference Location

  • United States