Iodopyridine-for-iodobenzene substitution for use with low molecular weight radiopharmaceuticals: Application to m-iodobenzylguanidine

Ganesan Vaidyanathan, Michael R. Zalutsky, Timothy R DeGrado

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

Substituting a pyridine ring for a benzene ring in the acylation agent N-succinimidyl 3-iodobenzoate has resulted in a useful approach for the radiohalogenation of monoclonal antibodies, peptides, and labeled biotin conjugates. It was hypothesized that such a substitution in m-iodobenzylguanidine (MIBG), a radiotracer used in the detection and treatment of neuroendocrine tumors, might result in an analogue with more rapid normal tissue clearance, thereby facilitating its use for tumor therapy. For the preparation of this analogue, 3-guanidinomethyl-5-iodopyridine (GMIP; 9b), the silicon precursor 4 was synthesized starting from 5-bromonicotinic acid. Attempts to convert 4 to 9b under various conditions were not successful. Radioiodinated 9b could be prepared by the iododestannylation of the tin precursor 8 in 65-70% radiochemical yield. A number of in vitro, in vivo, and ex vivo studies showed that pyridine-for-benzene substitution in MIBG yielded a compound that no longer was taken up by the uptake-1 pathway.

Original languageEnglish (US)
Pages (from-to)758-764
Number of pages7
JournalBioconjugate Chemistry
Volume9
Issue number6
DOIs
StatePublished - Nov 1998
Externally publishedYes

Fingerprint

3-Iodobenzylguanidine
Radiopharmaceuticals
Benzene
Pyridine
Tumors
Substitution reactions
Molecular Weight
Molecular weight
Acylation
Monoclonal antibodies
Neuroendocrine Tumors
Tin
Silicon
Biotin
Peptides
Monoclonal Antibodies
Tissue
Acids
Neoplasms
pyridine

ASJC Scopus subject areas

  • Chemistry(all)
  • Organic Chemistry
  • Clinical Biochemistry
  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

Iodopyridine-for-iodobenzene substitution for use with low molecular weight radiopharmaceuticals : Application to m-iodobenzylguanidine. / Vaidyanathan, Ganesan; Zalutsky, Michael R.; DeGrado, Timothy R.

In: Bioconjugate Chemistry, Vol. 9, No. 6, 11.1998, p. 758-764.

Research output: Contribution to journalArticle

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