Synthesis of dydrogesterone by aromatization-dearomatization strategy
Bibliographic record
Abstract
Dydrogesterone as an agonist of the progesterone receptor is an important and selective synthetic progesterone used for the treatment of a variety of conditions associated with progesterone deficiency including menstrual cycle regulation, infertility, and prevention of miscarriage. Its manufacturing process employing photochemical reactions remains a significant challenge. Herein we report the first total synthesis of dydrogesterone via a key 10α-substitution-selective dearomative cyclizationfree of photochemical protocols starting from Hajos-Parrish ketone. A gram-scale synthesis is also accomplished from readily available 9-hydroxy-4-androstene-3,17-dione through a novel aromatization-dearomatization strategy of ring A in steroid chemistry. Key synthetic features include a facile chemical aromatization of 9-hydroxy-4-androstene-3,17-dione, efficient ligand-controlled asymmetric dearomative cyclization to install the 10α-Me group, and an effective hydroxyl-directed hydrogenation of sterically congested tetrasubstituted olefin to establish the 8β-H,9β-H stereochemistry.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 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) | 0.002 | 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; a candidate call from one source (direct Gemma or distilled Codex), 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".