On-resin Pictet-Spengler Cyclisation for 1,2,3,4-Tetrahydro-β-carboline-3-carboxylate (Tcc) Peptide Synthesis with Acid Labile Functional Tolerance
Why this work is in the frame
A frame that forgets how it found something cannot be audited. These are the routes that admitted this work.
Bibliographic record
Abstract
The constrained tryptophan (Trp) analogue 1,2,3,4-tetrahydro-β-carboline-3-carboxylic acid (Tcc) is used to restrict peptide conformation in structure-activity relationship studies. Although Pictet-Spengler cyclization of Trp and aldehydes with mineral acid gives Tcc analogues, such harsh conditions do not tolerate acid labile functionality. To enable broader use of Tcc residues, mild conditions are now reported for the on-resin Pictet-Spengler cyclisation in the presence of acid labile side chain protection and linker strategies.
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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) | 0.001 | 0.001 |
| 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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