Lipophilicity coefficients of potential tumor imaging agents, positron-labeled O6-benzylguanine derivatives

Xuan Liu, Ji Quan Wang, Qi Huang Zheng

Research output: Contribution to journalArticle

8 Scopus citations


Novel radiolabeled O6-benzylguanine (O6-BG) derivatives, 6-O-[11C]-[(methoxymethyl)benzyl]guanines ([11C]p-O6-MNMG, 1a; [11C]m-O6-MMBG, 1b; [11C]o-O6-MMBG, 1c), 2-amino-6-O-[11C]-[(methoxymethyl)benzyloxy]-9-methyl purines ([11C]p-O6-AMMP, 2a; [11C]m-O6-AMMP, 2b; [11C]o-O6-AMMP, 2c), 2-amino-6-O-[11C]-[(methoxymethyl)benzyloxy]-9-benzyl purines ([11C]p-O6-AMBP, 3a; [11C]m-O6-AMBP, 3b; [11C]o-O6-AMBP, 3c), 2-amino-6-O-benzyloxy-9-[11C]-[(methoxycarbonyl)methyl]purine ([11C]ABMMP, 4), and 2-amino-6-O-benzyloxy-9-[11C]- [(4′-methoxycarbonyl)benzyl]purine ([11C]ABMBP, 5), have been synthesized for evaluation as potential novel positron emission tomography tumor imaging agents. The ability of O6-BG analogs to penetrate the blood-brain barrier in brain tumor could be due, at least in part, to their lipophilicity. In this paper, we measured lipophilicity coefficients (log P) of compounds 1-5 by the C18 HPLC method. These log P values were compared, and correlations between lipophilicity and biological activity of selected analogs were made. The results suggest the appropriate level of lipophilic character in this class of compounds as useful imaging agents appears to be in the range of 1.4-2.6.

Original languageEnglish (US)
Pages (from-to)379-384
Number of pages6
JournalBiomedical Chromatography
Issue number5
StatePublished - Jun 1 2005


  • HPLC
  • Lipophilicity coefficients
  • O-benzylguanine derivatives
  • Positron emission tomography
  • Tumor imaging agents

ASJC Scopus subject areas

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

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