Tantalum Catalyzed Hydroaminoalkylation Enables a Telescoping Catalytic Reaction Sequence for the Synthesis of Benzoannulated Indolizidines and Quinolizidines
Bibliographic record
Abstract
The synthesis of benzoannulated indolizidines and quinolizidines is described through a telescoping reaction sequence featuring hydroaminoalkylation and nickel-catalyzed C–N bond coupling. An in situ generated tantalum (V) ureate catalyst is used to form new Csp 3 ─Csp 3 bonds between saturated N -heterocycles and ortho -chlorostyrene enabled by the α C─H bond activation of the amine. The addition of a nickel C─N coupling catalyst generated from Ni(COD) 2 and DPPF to the reaction mixture allowed for cyclization. Our method leverages the regiodivergent branched and linear products accessed from N -heterocycle and styrene combinations, which are uniquely achieved by our tantalum catalyst to produce new N -heterocycle framework derivatives. Total isolated overall yields of up to 86% were achieved in a single pot. These advances highlight alternative bond disconnections that enable direct access to distinct new N -heterocycle derivatives through early transition metal catalyzed hydroaminoalkylation.
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
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".