Large-scale synthesis of the bifunctional chelating agent 2-(p-nitrobenzyl)-1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴- tetraacetic acid, and the determination of its enantiomeric purity by chiral chromatography

Oliver Renn, Claude F. Meares

Research output: Contribution to journalArticle

59 Scopus citations


The attachment of radiometals to monoclonal antibodies for medical applications requires extreme stability under physiological conditions, with no significant release of metal. Chelators that can hold radiometals like 111In, 67Ga, and 90Y with high stability under these conditions are essential for radiotherapy or immunoscintigraphy. 2-(p-Nitrobenzyl)-1,4,7,10-tetraazacyclododecane-N,N′,N″,N‴- tetraacetic acid (nitrobenzyl-DOTA) is one of the most promising bifunctional chelating agents. A large-scale synthesis of nitrobenzyl-DOTA is described. The overall yield for the nine-step synthesis sequence starting from nitrophenylalanine is 5.6%. Synthesis of nitrobenzyl-DOTA according to the new procedure yields up to ∼10 g without special apparatus. Both enantiomers of the chiral chelate nitrobenzyl-DOTA have been prepared, and their enantiomeric purity has been checked by chiral chromatography.

Original languageEnglish (US)
Pages (from-to)563-569
Number of pages7
JournalBioconjugate Chemistry
Issue number6
StatePublished - 1992


ASJC Scopus subject areas

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

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