Rapid and Efficient Synthesis of <sup>11</sup> C‐Labeled Benzimidazolones Using [ <sup>11</sup> C]Carbon Dioxide
Why this work is in the frame
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Bibliographic record
Abstract
Abstract [ 11 C]Carbon dioxide is an attractive synthon for the labeling of positron emission tomography (PET) tracers for subsequent use in biomedical research and drug development. In this study, [ 11 C]CO 2 was used for direct 11 C‐labeling of a set of cyclic aromatic ureas starting from their corresponding ortho ‐phenylenediamines, BEMP (2‐ tert ‐butylimino‐2‐diethylamino‐1,3‐dimethylperhydro‐1,3,2‐diazaphosphorine) as fixation base, and Mitsunobu reagents (DBAD, n Bu 3 P) for the intramolecular cyclization. The procedure is rapid (6 minutes total synthesis time), mild (proceeds at room temperature) and provided a set of 11 C‐benzimidazolones in good to excellent radiochemical yields. As a final testament to the utility of this method, the beta‐adrenoceptor PET ligand [ 11 C]CGP12177, was successfully prepared using the optimized conditions.
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.001 | 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