Total Synthesis of Ginkgolide C and Formal Synthesis Ginkgolides A and B
Bibliographic record
Abstract
Ginkgolides are diterpenes isolated from ginkgo biloba that exhibit strong PAF antagonistic activity as well as other interesting neuroprotective properties. These natural products possess a compact, highly oxygenated hexacyclic structure with two adjacent quaternary carbon centers, an unusual tert-butyl group, and up to twelve contiguous stereogenic carbon centers. The molecular architecture of ginkgolides, coupled with their remarkable biological profile, continues to be a source of fascination but also presents a formidable challenge for chemical synthesis. Herein, we reported the first total synthesis of ginkgolide C and the formal syntheses of ginkgolides A and B. The key to achieving these syntheses is a careful orchestration of carbon-carbon bond formation, guided by the compact nature of the ginkgolide structure.
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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) | 0.000 | 0.000 |
| 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 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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".