Three‐Component Synthesis of <i>γ</i>‐Amino Esters with <i>α</i>‐Quaternary Carbon Centers via NHC/Photoredox Dual Catalysis
Why this work is in the frame
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Bibliographic record
Abstract
γ ‐Amino acid derivatives are important motifs in medicinal chemistry and have shown wide applicability as inhibitory neurotransmitters. An important class of these compounds feature α , α ‐disubstitution. However, established routes for the direct synthesis of γ ‐amino esters bearing α ‐quaternary centers are severely limited in both number of available routes and scope of the transformation. Herein a method is presented for the three‐component synthesis of α , α ‐disubstituted γ ‐amino esters via N‐heterocyclic carbene/photoredox dual catalysis. This reaction involves in situ formation of an acyl azolium ester which undergoes photocatalytic reduction to the key stabilized alkoxycarbonyl radical. This methodology is shown to be capable of synthesizing a wide variety of γ ‐amino esters with various α ‐quaternary centers in moderate to good yields, including a derivative of the drug loperamide. The diversity of products that can be synthesized facilitates the rapid generation of libraries of γ ‐amino acid derived compounds.
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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 | 0.001 |
| 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 | 0.000 | 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