Click-Chemistry Reactions in Radiopharmaceutical Chemistry: Fast & Easy Introduction of Radiolabels into Biomolecules for In Vivo Imaging
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Bibliographic record
Abstract
Today the term "click chemistry" is often used equivalent with the copper-catalyzed 1,3-dipolar Huisgen cycloaddition. Originally, the concept was introduced in 2001 to describe reactions fulfilling a set of criteria that are most useful for chemical syntheses in drug research. In radiopharmaceutical chemistry where short lived radioisotopes are introduced into various different substance classes for in vivo imaging of biochemical processes, the expanding field of radioactive bioconjugation has become predominant. Labeled biomolecules such as peptides, proteins and oligonucleotides generated via bioconjugation of chelators for radiometal introduction as well as novel valuable secondary precursors for (18)F labeling have enriched the growing field of molecular imaging substantially. When introducing radioactive nuclides with a very short half-life into biomolecules, some of the typical criteria defined by click-chemistry are more crucial than others. Time is always the most important issue, whereas avoiding the formation of by-products that have to be removed without chromatography is of minor importance. The short-lived radionuclide (11)C for example has a physical half-life of only 20 min so that the labeling procedure cannot exceed 40-60 minutes (2-3 half-lifes). In this contribution, we outline reactions and molecules which meet the requirements of click chemistry reactions and are suitable for radiosyntheses of short lived SPECT ((99m)Tc: t(1/2) = 6 h, (111)In: t(1/2) = 2.81 d) and PET ((11)C: t(1/2) = 20.3 min to (64)Cu: t(1/2) = 12.7 h) radiotracers for in vivo imaging of biological processes and review the contributions in the field of radiochemical "click-reactions" - 1,3-dipolar Huisgen cycloadditions and beyond.
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Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.001 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.003 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.004 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from it