Mono-endo-6-N,N-diethylcarbamoyl and bis-endo,endo-6,12-N,N-diethylcarbamoyl derivatives of Tröger’s base. Synthesis and exo-endo isomerization study
Why this work is in the frame
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Bibliographic record
Abstract
An efficient synthetic route to the mono-endo-6-N,N-diethylcarbamoyl and bis-endo,endo-6,12-N,Ndiethylcarbamoyl derivatives of Trger's base (TB), endo-7 and endo-8, is reported. Studies of reaction time, proton source, and additive allowed establishment of optimized conditions for the conversion of exo-7 into the corresponding isomer endo-7. With a longer reaction time, the exo,exo-6,12 bis-carbamoyl derivative exo-8 was converted into the corresponding endo,endo-bis-carbamoyl product endo-8. Single crystal X-ray crystallographic analysis confirmed the structural and stereochemical assignments made on the basis of 1 H NMR, mechanistic, and computational studies. Deuterium quench experiments using LDA, CD 3 ONa/CD 3 OD and DCl/CD 3 OD conditions of both exo-7 and exo-8 afforded exo-7d 1 and exo-8d 2 , respectively (> 95% deuterium incorporation), supporting an enolate mechanism for the isomerization. In contrast, when repeating the experiment with DCl/CD 3 OD, no deuterium was incorporated, suggesting the traditional ring-opening mechanism involving an iminium ion.
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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 | 0.001 |
| 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 | 0.000 | 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