C-11 Radiochemistry in Cancer Imaging Applications

Author(s): Z. Tu, R.H. Mach

Journal Name: Current Topics in Medicinal Chemistry

Volume 10 , Issue 11 , 2010

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Carbon-11 (C-11) radiotracers are widely used for the early diagnosis of cancer, monitoring therapeutic response to cancer treatment, and pharmacokinetic investigations of anticancer drugs. PET imaging permits non-invasive monitoring of metabolic processes and molecular targets, while carbon-11 radiotracers allow a “hot for cold” substitution of biologically active molecules. Advances in organic synthetic chemistry and radiochemistry as well as improved automated techniques for radiosynthesis have encouraged investigators in developing carbon-11 tracers for use in oncology imaging studies. The short half-life of carbon-11 (20.38 minutes) creates special challenges for the synthesis of C-11 labeled tracers; these include the challenges of synthesizing C-11 target compounds with high radiochemical yield, high radiochemical purity and high specific activity in a short time and on a very small scale. The optimization of conditions for making a carbon-11 tracer include the late introduction of the C-11 isotope, the rapid formation and purification of the target compound, and the use of automated systems to afford a high yield of the target compound in a short time. In this review paper, we first briefly introduce some basic principles of PET imaging of cancer; we then discuss principles of carbon-11 radiochemistry, focus on specific advances in radiochemistry, and describe the synthesis of C-11 radiopharmaceuticals developed for cancer imaging. The carbon-11 radiochemistry approaches described include the N,O, and S-alkylations of [11C]methyl iodide/[11C]methyl triflate and analogues of [11C]methyl iodide and their applications for making carbon-11 tracers; we then address recent advances in exploring a transmetallic complex mediated [11C]carbonyl reaction for oncologic targets.

Keywords: Carbon-11, cancer imaging, Molecular imaging, radiosynthesis, radiochemistry, PET imaging

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Article Details

Year: 2010
Page: [1060 - 1095]
Pages: 36
DOI: 10.2174/156802610791384261
Price: $65

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