Palladium-Catalyzed Tsuji-Trost-Type Vinyl Epoxide Cross-Coupling with Umpolung Hydrazones
Bibliographic record
Abstract
Recognized as versatile building blocks, vinyl epoxides have been used as electrophiles to generate compounds of high synthetic value. However, selective functionalization of vinyl epoxides via carbon-carbon (C–C) bond formation has been a major challenge for many years due to its unique chemical reactivity. Current methodologies involve transition metal-activated vinyl epoxides with both stabilized and non-stabilized carbon nucleophiles. Procedures involving stabilized carbanions have limited applicability due to the use of pre-functionalized cyano-, sulphonyl or carbonyl derivatives. Non-stabilized carbanions in the form of organometallic reagents have shown to be robust and versatile reagents in C–C bond formation; however, they are employed in superstoichiometric quantities, require the protection of active functional groups, and generate copious amounts of metallic waste. Therefore, the development of alternative mild carbanion sources is highly desired. In this work, we report a highly chemo- and regioselective palladium-catalyzed vinyl epoxide cross-coupling utilizing hydrazones as organometallic equivalents (HOME). Hydrazones, generated from carbonyl-containing renewable feedstocks, enable a more sustainable reaction, and provide an alternative to highly reactive and sensitive unstabilized organometallic reagents. A broad substrate scope, with high functional group tolerance, is demonstrated along with the late-stage functionalization of natural product derivatives.
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How this classification was reachedexpand
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 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.000 |
| Open science | 0.001 | 0.002 |
| Research integrity | 0.001 | 0.003 |
| Insufficient payload (model declined to judge) | 0.001 | 0.001 |
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 itClassification
machine, unvalidatedMachine predicted; both teacher heads agree on what is shown here.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".