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Design of Radioiodinated Pharmaceuticals: Structural Features Affecting Metabolic Stability towards in Vivo Deiodination
Author(s) -
Cavina Lorenzo,
van der Born Dion,
Klaren Peter H. M.,
Feiters Martin C.,
Boerman Otto C.,
Rutjes Floris P. J. T.
Publication year - 2017
Publication title -
european journal of organic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.825
H-Index - 155
eISSN - 1099-0690
pISSN - 1434-193X
DOI - 10.1002/ejoc.201601638
Subject(s) - chemistry , in vivo , biodistribution , iodine , metabolic stability , radiochemistry , iodine compounds , catabolism , radionuclide , combinatorial chemistry , metabolism , in vitro , biochemistry , organic chemistry , microbiology and biotechnology , physics , quantum mechanics , biology
Radioiodinated pharmaceuticals are convenient tracers for clinical and research investigations because of the relatively long half‐lives of radioactive iodine isotopes (i.e., 123 I, 124 I, and 131 I) and the ease of their chemical insertion. Their application in radionuclide imaging and therapy may, however, be hampered by poor in vivo stability of the C–I bond. After an overview of the use of iodine in biology and nuclear medicine, we present here a survey of the catabolic pathways for iodinated xenobiotics, including their biodistribution, accumulation, and biostability. We summarize successful rational improvements in the biostability and conclude with general guidelines for the design of stable radioiodinated pharmaceuticals. It appears to be necessary to consider the whole molecule, rather than the radioiodinated fragment alone. Iodine radionuclides are generally retained in vivo on sp 2 carbon atoms in iodoarenes and iodovinyl moieties, but not in iodinated heterocycles or on sp 3 carbon atoms. Iodoarene substituents also have an influence, with increased in vivo deiodination in the cases of iodophenols and iodoanilines, whereas methoxylation and difluorination improve biostability.