Synthesis of 2-amino-6-(4-[ 11C]methoxyphenylthio)-9-[2- (phosphonomethoxy)ethyl]purine bis(2,2,2-trifluoroethyl) ester as a novel potential PET gene reporter probe for HBV and HSV-tk in cancers

Ji Quan Wang, Xiangshu Fei, Thomas A. Gardner, Gary D. Hutchins, Qi Huang Zheng

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17 Scopus citations


Synthesis of radiolabeled antiviral nucleoside analogue 2-amino-6-(4-[ 11C]methoxyphenylthio)-9-[2-(phosphonomethoxy)ethyl]purine bis(2,2,2-trifluoroethyl) ester ([ 11C]ABE) as a novel potential PET reporter probe for hepatitis B virus (HBV) and herpes simplex virus thymidine kinase (HSV-tk) in cancers is reported. Acyclic nucleoside 2-amino-6-(4- methoxyphenylthio)-9-[2-(phosphonomethoxy)ethyl]purine bis(2,2,2-trifluoroethyl) ester (ABE, 1) is a new hepatitis B virus (HBV) specific antiviral reagent and shows high anti-HBV activity. Carbon-11 labeled ABE may serve as a novel reporter probe for positron emission tomography (PET) to image HBV and herpes simplex virus thymidine kinase (HSV-tk) in cancers. The radiolabeling precursors 2-amino-6-(4-hydroxyphenylthio)-9-[2-(phosphonomethoxy)ethyl]purine bis(2,2,2-trifluoroethyl) ester (10) and 2-N-Boc protected analogue 2-N-bis(Boc)amino-6-(4-hydroxyphenylthio)-9-[2-(phosphonomethoxy)ethyl]purine bis(2,2,2-trifluoroethyl) ester (12), and the reference standard ABE were synthesized from bis(trifluoroethyl) (2-iodoethoxy)methylphosphonate (5), guanine (6), and 2-amino-6-chloropurine (8). The target radiotracer 2-amino-6-(4-[ 11C]methoxyphenylthio)-9-[2-(phosphonomethoxy)ethyl] purine bis(2,2,2-trifluoroethyl) ester ([ 11C]ABE, [ 11C]1) was prepared by O-[ 11C]methylation of the unprotected HO-precursor 10, or 2-N-Boc protected HO-precursor 12 with [ 11C]methyl triflate followed by a quick deprotection reaction, and isolated by solid-phase extraction (SPE) purification in 40-55% radiochemical yields.

Original languageEnglish (US)
Pages (from-to)549-556
Number of pages8
JournalBioorganic and Medicinal Chemistry
Issue number2
StatePublished - Jan 17 2005

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Medicine
  • Molecular Biology
  • Pharmaceutical Science
  • Drug Discovery
  • Clinical Biochemistry
  • Organic Chemistry

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